Blender Git Loki

Fix for invalid access to undefined hair data in edge-only cloth meshes.

Cloth data is used both for hair and actual cloth, which makes things
really difficult. The face number was used for distinguishing the two
types (no faces == hair mesh), but the extra hair data necessary for
hair sim is generated by particles and not available for edge-only cloth
meshes. This really needs to be sanitized ...

Conflicts:
source/blender/physics/intern/BPH_mass_spring.cpp