Make checksum safe against raw file store save() returning null.
Merge pull request #1135 from joshmoore/10235-npe-editor

Fix NPE during Editor startup in AutosaveRecovery.java (Fix #10235)
Merge pull request #1122 from mtbc/zero-file-dev_4_4

Make checksum safe against raw file store save() returning null (rebase)
Fix long-missing DELETE EventLogs

This check has been wrong throughout the 4.4 series.
If this is the last element, then EventLogs should be
raised for every OriginalFile deleted. This has not
been happening. (Very sadly)

This should be rebased onto dev_4_4