Add check for null in countCommitsSince #4
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...because e.g. branchPoint() may return null
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...because e.g.
branchPoint()may returnnull.This can happen if we're on a branch from where a
branchPointcannot be determined. In that case, thebranchPoint()method may returnnullwhich leads to aNullPointerExceptionif used together withcountCommitsSince(branchPoint("origin/develop")).