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).

source/blender/editors/physics/rigidbody_object.c

@@ -100,10 +100,6 @@ bool ED_rigidbody_object_add(Scene *scene, Object *ob, int type, ReportList *rep
 		BKE_report(reports, RPT_ERROR, "Can't add Rigid Body to non mesh object");
 		return false;
 	}
-	if (((Mesh *)ob->data)->totpoly == 0) {
-		BKE_report(reports, RPT_ERROR, "Can't create Rigid Body from mesh with no polygons");
-		return false;
-	}
 
 	/* Add rigid body world and group if they don't exist for convenience */
 	if (rbw == NULL) {