Possibility to set jsbach_nc="" in runscript if on Ollie (because missing...

Possibility to set jsbach_nc="" in runscript if on Ollie (because missing _no-dynveg flag in filename on /work/ollie/poll/)

functions/jsbach/jsbach.functions

@@ -22,7 +22,10 @@ jsbach_set_defaults()
                 jsbach_nc=""
                 jsbach_message="${jsbach_message}; CD: had to set \$jsbach_nc manually to \"\""
         else
-                jsbach_nc="_no-dynveg"
+                # check if jsbach_nc is unset; otherweise it is set to empty string in runscript
+                if [ -z ${jsbach_nc+x} ]; then
+                    jsbach_nc="_no-dynveg"
+                fi
                 jsbach_message="\t\tRunning WITHOUT dynamic vegetation"
         fi