Evaluate error string lazily for performance. #1116
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While profiling our test suite, I noticed a significant amount of time is spent in various
__repr__methods infactory_boy. Most of these calls come fromResolver.__getattr__which uses them to generate pretty error messages. While it's nice to have user friendly error messages, this is frequently called fromdeepgetattrwhich dismisses the error immediately. Therefore, the actual string may be lazily evaluated only when necessary. This simple change significantly improves our test suite run time.