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UKVSTS WorkItemCheckBox crashes if Work Item data source is null

description

This issue occurred when Work Item edit form that was hosting the check box was in a process of disposing. During disposing, work item edit form invalidates data sources for all its controls by setting them to null. WorkItemCheckBox implementation of InvalidateDatasource method uses WorkItemDatasource property which is null at that moment. NullReferenceException is thrown.

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