Commit fc19c949 authored by Bastien Nocera's avatar Bastien Nocera

thumbnail: Fix runtime warning getting a preview icon

If we tried to get a preview thumbnail for a file, but that preview icon
did not exist, then we'd generate a warning trying to add a reference to
that GIcon.

Fixes: e629e46a
parent e83305b9
Pipeline #54664 passed with stage
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