fixed bug where null display method could be added to the ChipCanvas from the chip. now checks if the chips display method is null before adding it to methods.
fixed bug where null display method could be added to the ChipCanvas from the chip. now checks if the chips display method is null before adding it to methods.

git-svn-id: e3d3b427d532171a6bd7557d8a4952a393b554a2@887 b7f4320f-462c-0410-a916-d9f35bb82d52

SensorsINI/jaer,viktorbahr/jaer,viktorbahr/jaer,SensorsINI/jaer,viktorbahr/jaer,SensorsINI/jaer,SensorsINI/jaer,SensorsINI/jaer,SensorsINI/jaer,viktorbahr/jaer,SensorsINI/jaer,SensorsINI/jaer,viktorbahr/jaer,viktorbahr/jaer,viktorbahr/jaer