Arjen Hiemstra 8039184c18 Move setting error checking to StartSliceJob and allow the job to return a proper response
Now the job can determine if we can continue with slicing or not and if
not, why not.

This also means we can now show a message when we cannot find any
slicable objects.

Contributes to CURA-1278
2016-05-30 13:03:06 +02:00
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