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Fix T40447: Creating Rigid Bodies is rejected for meshes without polys.

This check prevents using empty (no faces) meshes as rigid bodies.
While the idea makes sense, it also prevents using modifier-constructed
meshes, where faces are added only by the modifiers.

Further the check is very easy to circumvent, by removing faces after
making the rigid body, or by assigning a different mesh datablock
afterward.

Suggested by Fabian Emmes (@der_fab).