simple plot - geodata check

[SimonRubenDrauz]

In simple plot sometimes it is checked if the geodata of a bus, a component is attached to, is given or not (e.g. in case of the trafos), sometimes it is not checked at all. It should be chooses one way and not a mix of both.

[SteffenMeinecke]

I would prefer a check since this shouldn't take so much time.