check result of getImage() for null to prevent NPE
Merge pull request #835 from millmanorama/eo1_npe_fix

check result of getImage() for null to prevent NPE
Correct formatting of a line in ingest module develop guide
Merge pull request #836 from rcordovano/develop

Correct formatting of a line in ingest module develop guide
Merge remote-tracking branch 'upstream/develop' into jython_ingest_modules
Update ingest module developer guide for Jython