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Switch to !empty instead of isset
Helpful in case of corrupted attachment properties.
Minor hotfix.
What we recently found is that when autoresend from gmail to yandex -- someone "kills" filename property of attachments. It becomes just empty. So instead of isset it's better use !empty.
Code coverage not changed. Tests was run locally.
ps: Btw, it's better to switch to docker already ))
TRavis failed as of it fails in master/develop too.