bugfix with readFaces()

WFObj.cc

@@ -302,7 +302,7 @@ vector<WFObj::Face> WFObj::readFaces(const std::vector<std::string> & parts)
     f.vertices[1] = refs[1];
     f.vertices[2] = refs[2];
     faces.push_back(f);
-    if (parts_len == 4)
+    if (parts_len == 5)             /* 4 vertex refs */
     {
         f.vertices[0] = refs[2];
         f.vertices[1] = refs[3];