[5.3] Backport fixes for image validation #17983
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Backport of #17944. `getimagesize` will fail with a notice on files smaller than 12 bytes. This ends up becoming an ErrorException which is pretty annoying. Suppressing the warning is enough to still end up with a `false` result which will fail the validation gracefully instead of grueing up your stew.
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Namely:
Note 5.3 didn't have the mistake fixed in #17943 (Fix image dimension ratio check), it was introduced in 5.4.