Fix creating CC/VV diffs that have moved files.
Review Request #12893 — Created March 15, 2023 and submitted
Some code movement in the ClearCase/VersionVault client ended up breaking
the moved file case, where we tried to access a variable before defining it.
This wasn't immediately caught because my local test cases involved activities
that created a new file and then moved it, all in the same activity (which works
Created an activity that moved an existing file. Saw the correct diff instead of
an RBTools crash.