creator.c wasn't updated in my last commit, here it is (the change reverts my...

creator.c wasn't updated in my last commit, here it is (the change reverts my previous change to it, since it was made unnecessary by handling onload scriptlinks a little differently, as can be checked in blender.c and editscreen.c).

- BPython:  finishing object and nmesh .setMaterials commit, fixing two bugs.  Also fixed a crash with object.track (pointer wasn't checked for validity).  All based on reports and patch by Yann Vernier, thanks again.