Issue description
An excavator which can't find an accessible place to mine from (in this case, because a landslide changed the topography) sometimes cycles through statuses while doing nothing and consuming fuel, with no alert being triggered.
Expected behavior
An excavator which gets stuck for an extended period should trigger an alert. An excavator shouldn't use fuel when stationary, even if it's thinking really hard.
Game version
0.5.1b (206)
Attachments
excavator-bug-0.5.1b.save
