Merge pull request #1059 from mantidproject/1050_fix_crash_on_delete_msl

Remove invisible workspace from MSlice when deleted in ADS

Author: SilkeSchomann

src/mslice/presenters/workspace_manager_presenter.py

@@ -271,6 +271,8 @@ def _clear_displayed_error(self):
         self._workspace_manager_view.clear_displayed_error()
 
     def delete_handle(self, workspace):
+        if workspace.startswith("__MSL"):
+            workspace = workspace[5:]
         delete_workspace(workspace)
         self.update_displayed_workspaces()