Feature adaptive refinement causes Hbr::GuaranteeNeighbors() to leave behind some un-connected face-vertices. FarSubdivisionTablesFactory has been hardened so as to not trip over these, but apparently Gregory patch valence tables generation is tripping over one of those in FarPatchTablesFactory.
Feature adaptive refinement causes Hbr::GuaranteeNeighbors() to leave behind
some un-connected face-vertices. FarSubdivisionTablesFactory has been hardened
so as to not trip over these, but apparently Gregory patch valence tables
generation is tripping over one of those in FarPatchTablesFactory.

fixes #162

c64kernal/OpenSubdiv,shengfuintel/OpenSubdiv,shengfuintel/OpenSubdiv,takahito-tejima/OpenSubdiv,takahito-tejima/OpenSubdiv-exp,xldeveloper/OpenSubdiv,poljere/OpenSubdiv,jcowles/OpenSubdiv,jcowles/OpenSubdiv,takahito-tejima/OpenSubdiv-exp,jcowles/OpenSubdiv,takahito-tejima/OpenSubdiv,nyotis/OpenSubdiv,anshuarya/OpenSubdiv,takahito-tejima/OpenSubdiv,lookup1980/OpenSubdiv,poljere/OpenSubdiv,anshuarya/OpenSubdiv,nyotis/OpenSubdiv,lookup1980/OpenSubdiv,lookup1980/OpenSubdiv,takahito-tejima/OpenSubdiv-exp,takahito-tejima/OpenSubdiv-exp,xldeveloper/OpenSubdiv,nyotis/OpenSubdiv,poljere/OpenSubdiv,c64kernal/OpenSubdiv,c64kernal/OpenSubdiv,shengfuintel/OpenSubdiv,xldeveloper/OpenSubdiv,anshuarya/OpenSubdiv