Added archive existence check before creating it.
Merge branch 'issue-1314' of github.com:cm-jan/CM into issue-1417
Add CM_Model_StreamChannelArchive_Video::findById($id)
Replace direct sql query with findById()
Make CM_Model_StreamChannelArchive_VideoTest::testFindById independent of channel->onUnpublish
Simplify testOnUnpublish with findById, make sure archiving can be run multiple times
Replace duplicate declaration
Merge pull request #1417 from tomaszdurka/issue-1417

Integrity constraint violation: cm_streamChannelArchive_video