Fix panic for fetching group avatar #291
Merged
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Tracing assumed the path was always at least 4 characters long. This would panic with the empty path which can be the value of a group avatar path if no avatar is set for the group.
While this panic is easy to prevent in presage (which I also did here), this panic should still be removed from libsignal-service-rs.
(CI failure is again in nightly and most likely not my fault)