fix: brush tool crashes synfig if no layer is selected in the dialog #3157
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Fixes one of the two issues in #1161
Opening brush tool and then clicking cancel in the file chooser dialog crashed Synfig (before this pr). The brush tool still crashes Synfig when used though on correct files I will work on that in another PR.
Current state after fix:
Screencast from 08-04-2023 06:00:38 PM.webm