Check ReferencePrt is not empty. Remove doxygen comments.
Check ReferencePrt is not empty. Remove doxygen comments.

[skip CI]
opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core