grep: don't look up copy info unless --follow is given If no --follow was given, then the "copy" variable will become None. In that case we would still look up the copy information from the filelog and then ignore it. Let's avoid even looking it up. Differential Revision: https://phab.mercurial-scm.org/D5620

hghave: let OSError with ENOENT through like any other Before this patch, if we get an OSError with ENOENT, we would not re-raise it and would instead run into an undefined variable ("p") soon thereafter. Differential Revision: https://phab.mercurial-scm.org/D5631