treat no rho as empty in _rho case

git-svn-id: https://spcsvn.epfl.ch/repos/TCV/gdat/trunk@5095 d63d8f72-b253-0410-a779-e742ad2e26cf

crpptbx/TCV/gdat_tcv.m

@@ -849,7 +849,8 @@ elseif strcmp(mapping_for_tcv.method,'switchcase')
         rho(ir,:)= sqrt(1.-psiscatvol.data(:,ir)./psi_max.data(:))';
       end
     else
-      rho=NaN;
+      if gdat_params.nverbose>=1; warning(['psiscatvol empty?, no rho calculated for data_request = ' data_request_eff]); end
+      rho=[];
     end
     gdat_data.dim{1}=rho;
     gdat_data.dimunits=[{'sqrt(psi_norm)'} ; {'time [s]'}];