Allow zero-length environment variables
merge develop -D org: PR 745 (OMERO.matlab improvements (rebased onto develop))
merge develop -D org: PR 750 (ant: Set SOURCE_BRANCH and OMERO_RELEASE using omero.shortversion)
merge develop -D org

Repository: openmicroscopy/ome-documentation
Excluded PRs:
  # PR 743 sbesson 'Propose redesign of OMERO and Bio-Formats 5.0 CI jobs' (exclude comment)
Already up-to-date.

Merged PRs:
  # PR 745 sbesson 'OMERO.matlab improvements (rebased onto develop)'
  # PR 750 rleigh-dundee 'ant: Set SOURCE_BRANCH and OMERO_RELEASE using omero.shortversion'
Conflicting PRs (not included):
  # PR 752 rleigh-dundee 'ant: Support API doc generation'

Generated by OMERO-5.1-merge-push#174 (http://ci.openmicroscopy.org/job/OMERO-5.1-merge-push/174/)