My commit to fix weightpaint display (revision 1.125 of DerivedMesh.c) broke
normal recalculation for meshes which have only deform modifiers applied.
This commit fixes that by adding calls to CDDM_calc_normals in the appropriate
places.
The DM_from_template and DM_init functions checked for numVerts > 0 before
initialising the DerivedMesh's custom data layers. This was something of a
hack intended to allow DerivedMesh creation functions to initialise default
function pointers without initialising custom data layers (by passing a 0 for
the numVerts parameter). It is unneeded now that DM_init_funcs is present, and
causes memory deallocation warnings later on when the number of vertices
really is 0, so it has been removed.
e3d1a6ea9b