Fixing compilation when incompatible structure to be skipped for writing

src/VTKWriter/VTKWriter_grids_util.hpp

@@ -1011,6 +1011,9 @@ struct meta_prop_new<I,ele_g,St,T,false>
 	inline meta_prop_new(const openfpm::vector< ele_g > & vg, std::string & v_out, const openfpm::vector<std::string> & prop_names, file_type ft)
 	{
 	}
+	static inline void get_pvtp_out(std::string & v_out, const openfpm::vector<std::string> & prop_names)
+	{
+	}
 };
 
 template<unsigned int dims,typename T> inline void output_point(Point<dims,T> & p,std::stringstream & v_out, file_type ft)