Add test of SAME_ERROR environmental variable

SiteTests/FroNtier/tests/CMSSW_frontier.sh

@@ -20,6 +20,14 @@ then
    exit 1
 fi
 #
+# Check that environmental variable SAME_ERROR is set
+#
+if [ ! "${SAME_ERROR}" ]
+then
+   printf "CMSSW_frontier.sh: Error. SAME_ERROR not defined\n"
+   exit 1
+fi
+#
 # Check that scramv1 command was defined by . $CMS_PATH/cmsset_default.sh
 #
 type scramv1 > /dev/null 2>&1