Merge branch 'fixDoubleMesh' into 'master'

fixed bug where meshes were doubled when bidirectional conversion was

See merge request !1

MeshConvert.cc

@@ -137,7 +137,7 @@ int MeshConvertPlugin::convert(int _id, bool _toTriMesh)
   }
   else
   {
-    if( PluginFunctions::getMesh(_id,t))
+    if(!_toTriMesh && PluginFunctions::getMesh(_id,t))
     {
       PolyMesh  converted = static_cast<PolyMesh>(*t);
       emit addEmptyObject(DATA_POLY_MESH, newID);