issue_2016

only add material uv mappings if set, ignore when no uvmapping set
removed unneccessary pad_i1 field (to prevent unnecessary field read exceptions)

code/BlenderLoader.cpp

@@ -1045,7 +1045,10 @@ void BlenderImporter::ConvertMesh(const Scene& /*in*/, const Object* /*obj*/, co
                 }
             }
         }
-        matTexUvMappings.insert(std::make_pair(m, texuv));
+        if (texuv.size())
+        {
+            matTexUvMappings.insert(std::make_pair(m, texuv));
+        }
     }
 
     // collect texture coordinates, they're stored in a separate per-face buffer