Viewer cannot display studies when UIDs in the database do not match files

[Charlie Moore]

To recreate this:

1. In an existing project with at least one session, set the project anonymization script to:

   (0020,000E) := hashUID[(0020,000E)]

2. Find a session in the project which loads in the viewer just fine.

3. Edit the session and change the session label. This will trigger project anonymization to run again for this session. Hence, the DICOM files in the session now have new Series Instance UIDs, but this is not reflected in the XNAT database/catalog.
4. Regenerate the metadata for the session. When that completes, the “dicomweb” URLs will have “null” instead of the scan IDs.

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[Charlie Moore]

Relates to https://issues.xnat.org/browse/XNAT-6088