Check() crash in merge tool when using SVN

A UDN user found a crash in the merge tool when using SVN.

https://udn.unrealengine.com/questions/265740/crashbug-with-svn-merging.html

The failing check() crash occurs in LoadBaseRev (Merge.cpp):

 TSharedPtr<ISourceControlRevision, ESPMode::ThreadSafe> Revision = SourceControlState.GetBaseRevForMerge();
 check(Revision.IsValid()); /// <- This fails

This is because SourceControlState.GetBaseRevForMerge() returns a null ISourceControlrevision. Which is because FSubversionSourceControlState::PendingMergeBaseFileRevNumber is not a valid revision for the particular file that is merging. The PendingMergeBaseFileRevNumber revision appears to be "head - 1" but the revision history array may not contain an entry for this as there may be gaps in the revision sequence for a particular file.

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