ENH: Refactoring getAssociatableObjects
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Split the original function in 2
- One that takes in a ReferenceItem
- One that takes in a ReferenceItemDefinition This allowed qtAssociation2ColumnWdiget to use the second function instead of having its own version (i.e. code duplication)
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Also added a null check for the reference item's attrbute
Closes #348 (closed)