Crash on creation of association when old association exists

[Matthias Schoettle]

When trying to replace old association uses with new ones (based on the current NewAssociationConcernReuses branch), the following crash occurs, because the old Association concern is loaded locally.

Caused by: java.lang.NullPointerException
    at ca.mcgill.sel.ram.controller.AssociationController.getSelectedFeatures(AssociationController.java:454)
    at ca.mcgill.sel.ram.controller.AssociationController.getSelectedFeatures(AssociationController.java:201)
    at ca.mcgill.sel.ram.controller.AssociationController.createFeatureSelection(AssociationController.java:125)
    at ca.mcgill.sel.ram.controller.AssociationController.createFeatureSelection(AssociationController.java:95)
    at ca.mcgill.sel.ram.controller.StructuralViewController.createAssociation(StructuralViewController.java:317)
    at ca.mcgill.sel.ram.ui.views.structural.handler.impl.StructuralViewHandler.createAssociation(StructuralViewHandler.java:474)
    at ca.mcgill.sel.ram.ui.views.structural.handler.impl.StructuralViewHandler.handleDoubleTapOnClass(StructuralViewHandler.java:292)
    at ca.mcgill.sel.ram.ui.views.structural.handler.impl.BaseViewHandler.processTapEvent(BaseViewHandler.java:160)

[Céline Bensoussan]

This is due to features not existing in the old Association Concern. It would be a temporary fix. The Association Concern needs to be updated.

Unhide the reuse to delete it properly by updating the code here: https://bitbucket.org/mcgillram/touchram/src/2449b25c5fb5f7df6f278feb2fbe2c12d42617c3/ca.mcgill.sel.ram.gui/src/ca/mcgill/sel/ram/ui/views/structural/InstantiationsContainerView.java?fileviewer=file-view-default#InstantiationsContainerView.java-335