Magic glue fails when no SHAPE constraint is present

[luxaritas]

Expected Behavior

Magic glue succeeds without a SHAPE constraint

Current Behavior

When there is no SHAPE constraint, the magic glue doesn't change the structure and fails with an error

Reproduction Steps

1. Create a puzzle with no SHAPE constraint and a region where magic glue can be used
2. Apply magic glue on two equal-sized regions
3. Instead of changing the target structure, nothing happens and an error is thrown in the console

Environment

No response

Other information

It appears to be throwing in ConstrantBar#getShapeBox, presumably for PoseEditMode#flashConstraintForTarget which flashes the constraint box on target change