Fix npe for rule axes on edit columns.
Fix npe for rule axes on edit columns.

jsnyder4/n-cube-editor,jdereg/n-cube-editor,tympollack/n-cube-editor,jdereg/n-cube-editor,jsnyder4/n-cube-editor,tympollack/n-cube-editor,kpartlow/n-cube-editor,jdereg/n-cube-editor,kpartlow/n-cube-editor,bheekin/n-cube-editor,bheekin/n-cube-editor