Change checkSpecConsistency() so no type error when all inputs are NA which may be case when there is no target value to be achieved.
Change checkSpecConsistency() so no type error when all inputs are NA which may be case when there is no target value to be achieved.

cities-lab/VisionEval,gregorbj/VisionEval,gregorbj/VisionEval,gregorbj/VisionEval,gregorbj/VisionEval