Rebuilding session in prearchive fails with anonymization

This is what's been going wrong in selenium test QA-181. It occurs with the more complicated anon script used there, but I've recreated it consistently using only the one-line anon script:

{code}
(0008,1010) := "King's Crossing"{code}

1. Set up site anonymization to use the above script.
2. Set up a new project
3. Load some DICOM (I used a subset of sample1) in DICOM browser.
4. Modify (0008,1030) to use your project ID.
5. Send.
6. When the data is all there, rebuild the session in the prearchive.
7. The session stays in Rebuilding status and you can't do anything with it. In the logs, there's stuff like...

jms.log:

{code}
2016-11-17 10:24:16,583 An error occurred processing a request from user admin to perform Rebuild operation on prearchive session at: /prearchive/projects/r/20161117_102405501/Sample_ID
java.lang.RuntimeException: org.xml.sax.SAXParseException; Premature end of file.
at org.nrg.xnat.helpers.prearchive.handlers.PrearchiveRebuildHandler.execute(PrearchiveRebuildHandler.java:103)
at org.nrg.xnat.services.messaging.prearchive.PrearchiveOperationRequestListener.onRequest(PrearchiveOperationRequestListener.java:25)
at sun.reflect.GeneratedMethodAccessor642.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:269)
at org.springframework.jms.listener.adapter.MessageListenerAdapter.invokeListenerMethod(MessageListenerAdapter.java:301)
at org.springframework.jms.listener.adapter.MessageListenerAdapter.onMessage(MessageListenerAdapter.java:230)
at org.springframework.jms.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:721)
at org.springframework.jms.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:681)
at org.springframework.jms.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:651)
at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.doReceiveAndExecute(AbstractPollingMessageListenerContainer.java:315)
at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.receiveAndExecute(AbstractPollingMessageListenerContainer.java:253)
at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.invokeListener(DefaultMessageListenerContainer.java:1164)
at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.executeOngoingLoop(DefaultMessageListenerContainer.java:1156)
at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.run(DefaultMessageListenerContainer.java:1053)
at java.lang.Thread.run(Thread.java:744)
Caused by: org.xml.sax.SAXParseException; Premature end of file.
at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at org.apache.xerces.util.ErrorHandlerWrapper.fatalError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLVersionDetector.determineDocVersion(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(SAXParser.java:195)
at org.nrg.xdat.bean.reader.XDATXMLReader.parse(XDATXMLReader.java:474)
at org.nrg.xnat.helpers.prearchive.handlers.PrearchiveRebuildHandler.execute(PrearchiveRebuildHandler.java:68)
... 16 more{code}

application.log:

{code}
2016-11-17 10:24:16,579 org.springframework.jms.listener.DefaultMessageListenerContainer#3-7 ERROR org.nrg.session.SessionBuilder - /data/xnat/prearchive/r/20161117_102405501/Sample_ID must contain exactly one session
org.nrg.session.SessionBuilder$NoUniqueSessionException: No session found
at org.nrg.session.SessionBuilder.writeSession(SessionBuilder.java:210)
at org.nrg.session.SessionBuilder.run(SessionBuilder.java:249)
at org.nrg.xnat.archive.XNATSessionBuilder.buildPetSession(XNATSessionBuilder.java:250)
at org.nrg.xnat.archive.XNATSessionBuilder.call(XNATSessionBuilder.java:209)
at org.nrg.xnat.helpers.prearchive.PrearcDatabase$13.extSync(PrearcDatabase.java:1059)
at org.nrg.xnat.helpers.prearchive.PrearcDatabase$13.extSync(PrearcDatabase.java:1029)
at org.nrg.xnat.helpers.prearchive.PrearcDatabase$LockAndSync.run(PrearcDatabase.java:1619)
at org.nrg.xnat.helpers.prearchive.PrearcDatabase.buildSession(PrearcDatabase.java:1080)
at org.nrg.xnat.helpers.prearchive.handlers.PrearchiveRebuildHandler.execute(PrearchiveRebuildHandler.java:50)
at org.nrg.xnat.services.messaging.prearchive.PrearchiveOperationRequestListener.onRequest(PrearchiveOperationRequestListener.java:25)
at sun.reflect.GeneratedMethodAccessor642.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:269)
at org.springframework.jms.listener.adapter.MessageListenerAdapter.invokeListenerMethod(MessageListenerAdapter.java:301)
at org.springframework.jms.listener.adapter.MessageListenerAdapter.onMessage(MessageListenerAdapter.java:230)
at org.springframework.jms.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:721)
at org.springframework.jms.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:681)
at org.springframework.jms.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:651)
at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.doReceiveAndExecute(AbstractPollingMessageListenerContainer.java:315)
at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.receiveAndExecute(AbstractPollingMessageListenerContainer.java:253)
at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.invokeListener(DefaultMessageListenerContainer.java:1164)
at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.executeOngoingLoop(DefaultMessageListenerContainer.java:1156)
at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.run(DefaultMessageListenerContainer.java:1053)
at java.lang.Thread.run(Thread.java:744){code}

CC: Dave Maffitt