Allow zero-length environment variables
merge dev_5_0 -D org: PR 749 (Adding API doc links to OMERO docs front page)
merge dev_5_0 -D org: PR 751 (ant: Set SOURCE_BRANCH and OMERO_RELEASE using omero.shortversion)
merge dev_5_0 -D org

Repository: openmicroscopy/ome-documentation
Already up-to-date.

Merged PRs:
  # PR 749 hflynn 'Adding API doc links to OMERO docs front page'
  # PR 751 rleigh-dundee 'ant: Set SOURCE_BRANCH and OMERO_RELEASE using omero.shortversion'
Conflicting PRs (not included):
  # PR 753 rleigh-dundee 'ant: Support API doc generation'

Generated by OMERO-5.0-merge-daily#638 (http://ci.openmicroscopy.org/job/OMERO-5.0-merge-daily/638/)