[variant_expiration] Do not rely on is_patch
to identify patches
#2207
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Fixes #2206
When the attachment is a link to Phabricator, the value of
is_patch
will be0
since the attachment itself is not a patch. Therefore, usingis_patch
to determine if an attachment is a patch will prevent the bot from recognizing that there is a patch attached.Checklist
to-be-announced
tag added if this is worth announcing