help: warn if specified 'man.viewer' is unsupported, instead of erroring out
When a document viewer that is unknown to the current version of git is specified in the .git/config file, instead of erroring out the process entirely, just issue a warning. It might be that the user usually is using a newer git that supports it (and the configuration is written for that version) but is temporarily using an older git that does not know the viewer. Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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