if sxr.t empty, say it

git-svn-id: https://spcsvn.epfl.ch/repos/TCV/gdat/trunk@1903 d63d8f72-b253-0410-a779-e742ad2e26cf

JET/loadJETdata.m

@@ -515,6 +515,10 @@ switch JETkeywrdcase{index}
         trace.name=[ 'jpf/' num2str(shot) '/' 'db/j3-sxr<vXX' '/1' name_ext];
       end
     end
+    if isempty(trace.t)
+      disp(['no data in ' trace.name])
+      return
+    end
   % calculating intersection of the view lines with magnetics axis 
   if strcmp(data_type_eff_noext,'sxR')
     if iloaded_data>0