Add debugging of NPE in InteractiveProcessorI

Intended for tracking down the problem on gretzky.
May not need to be merged.

cc @manics
merge dev_5_0 -Dorg -Ssuccess-only: PR 2309 (Add debugging of NPE in InteractiveProcessorI)
merge dev_5_0 -Dorg -Ssuccess-only

Repository: openmicroscopy/openmicroscopy
Excluded PRs:
  # PR 3233 aleksandra-tarkowska 'fixing broken tag form' (status: failure)
Already up-to-date.

Merged PRs:
  # PR 2309 joshmoore 'Add debugging of NPE in InteractiveProcessorI'

Repository: openmicroscopy/bioformats
Updating 33b1150..c744b67
Previously merged:
  # PR 1449 sbesson 'Add python-bioformats to the documentation (rebased onto dev_5_0)'
  # PR 1445 sbesson 'Update Eclipse instructions for Bio-Formats with link to ome-devel thread (rebased onto dev_5_0)'
  # PR 1446 melissalinkert 'Update version numbers to 5.0.7-SNAPSHOT'

Repository: ome/scripts
Already up-to-date.

Repository: openmicroscopy/ome-documentation
Updating 6dd7ecb..635a46d
Previously merged:
  # PR 1036 hflynn 'changing help link for editor'
  # PR 1035 hflynn 'Adding link to import scenarios to cli import doc (rebased onto dev_5_0)'
  # PR 1033 hflynn 'Fixing use of :option: for new sphinx (dev_5_0)'
  # PR 1029 aleksandra-tarkowska 'csrf protection'
  # PR 1030 hflynn 'Updating build no. for linux walkthrough'
  # PR 1028 snoopycrimecop 'Update auto-generated properties'
  # PR 1026 hflynn 'Adding note about openjdk8 not being supported'

Merged PRs:
  # PR 1043 aleksandra-tarkowska 'adding logout to the filter'

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