Prevent crash when missing datum (This can happen if the user mouseups on a tooltip, e.g. in walkthrough)
Prevent crash when missing datum
(This can happen if the user mouseups on a tooltip, e.g. in walkthrough)

morray/iD,openstreetmap/iD,bagage/iD,bagage/iD,kartta-labs/iD,AndreasHae/iD,digidem/iD,mapmeld/iD,AndreasHae/iD,morray/iD,AndreasHae/iD,mapmeld/iD,mapmeld/iD,ngageoint/hootenanny-ui,ngageoint/hootenanny-ui,openstreetmap/iD,1ec5/iD,digidem/iD,kartta-labs/iD,1ec5/iD,bagage/iD,ngageoint/hootenanny-ui,1ec5/iD,kartta-labs/iD,openstreetmap/iD