1.0dev: follow-up to r10904, 2nd param of unittest's `safe_repr` must be optional.
1.0dev: follow-up to r10904, 2nd param of unittest's `safe_repr` must be optional.

git-svn-id: f68c6b3b1dcd5d00a2560c384475aaef3bc99487@11218 af82e41b-90c4-0310-8c96-b1721e28e2e2

exocad/exotrac,exocad/exotrac,exocad/exotrac,exocad/exotrac