Fix incorrect reference to revision_range
Review Request #7290 — Created May 7, 2015 and submitted
The ClearCase backend still had a reference to options.revision_range. Since
this no longer exists, it would crash. I've moved the relevant check to an
appropriate place in the new implementation.
Ran unit tests.
Tool: Pyflakes Processed Files: rbtools/clients/clearcase.py Tool: PEP8 Style Checker Processed Files: rbtools/clients/clearcase.py