Fix git describe --tags on topic branches #136
Merged
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If there are no tags on a branch,
git describe --tags
infind_version.py
produces an error.Was like this in Travis for https://github.com/native-api/opencv-python/tree/readd_ipp_linux , see https://travis-ci.org/native-api/opencv-python/jobs/447134765 for a sample failure.