AttributeError when right clicking no items in Main Window TreeView #2470
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Issue
Close #2466
Description
When checking where in the tree view is being right clicked, if a stack is being selected then it will add the relevant options. If no stack is selected, then no right click options are added, so nothing happens.
Testing
make check
Acceptance Criteria
Load dataset in MI, right click the Tree view on a stack and in the whitespace below to check that the right click menu behaves as expected and that no errors occur.