GitLab

(vc-file-not-found-hook): Check, that `buffer-file-name' is
non-nil.  It is not clear, whether this is only fixing symptoms on
an error. OTOH, in all other cases, the call of `vc-file-clearprops'
is embedded by that check.  So it might be TRT.  Suggested by Dan
Nicolaescu <dann@ics.uci.edu>.