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Error displayed when attaching testcase to bug even though attach succeeds
The following error appears every time when submitting a bug with an attached testcase to bugzilla.

This was discussed previously on matrix and @EvaBardou mentioned that it occurs every time. If this is the case, we should not alert on this particular error.
See also: https://bugzilla.mozilla.org/show_bug.cgi?id=1675249