deleting sketch is untested

[magwas]

Caused by: org.rulez.magwas.zenta.model.UnTestedException
at org.rulez.magwas.zenta.model.impl.SketchModelBase.delete(SketchModelBase.java:176)
at org.rulez.magwas.zenta.editor.model.commands.DeleteCommand.execute(DeleteCommand.java:33)
at org.eclipse.gef.commands.CommandStack.execute(CommandStack.java:228)
at org.rulez.magwas.zenta.editor.views.tree.actions.DeleteAction.deleteUsingCommandStack(DeleteAction.java:75)
at org.rulez.magwas.zenta.editor.views.tree.actions.DeleteAction.run(DeleteAction.java:65)
at org.eclipse.jface.action.Action.runWithEvent(Action.java:473)
at org.eclipse.jface.commands.ActionHandler.execute(ActionHandler.java:122)