Nice error when passing non-GAM file to vg filter #4779
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Changelog Entry
To be copied to the draft changelog by merger:
vg filtergives a clean error when passing files that don't look like GAMsDescription
A long-term minor annoyance of mine: if you accidentally pass a valid non-GAM file (e.g. a TSV) to
vg filterit would try to read it as a GAM and then very verbosely and confusingly crash. This change checks whether the filename ends with.gam. If not, a short and readable error is printed. Standard input works as before since that can't be easily checked.