try to prevent malformed images from crashing fetcher, a=chris

Author Chris Pollett <chris@pollett.org>
Author date 2017-01-19 19:Jan:th
Author local date 2017-01-19 11:Jan:th -0800
Committer Chris Pollett <chris@pollett.org>
Committer date 2017-01-19 19:Jan:th
Committer local date 2017-01-19 11:Jan:th -0800
Commit cc4940509918fd75eb9a3ede544ee6cc1e2eb15c
Tree 496fe88b336edf5e04e06df01e2e68c8396226f7
Parent 9e19a2c893c00b5128dcf817f8594a67f4ef3464
try to prevent malformed images from crashing fetcher, a=chris
Affected files:
src/executables/Fetcher.php
src/library/CrawlConstants.php
src/library/FetchUrl.php
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