Bug #53424 Certain combination of flags give internal error

Reorder code breaks when finding tests skipped due to --skip-rpl etc.
Add simple test that master_opt is non-empty

mysql-test/lib/mtr_cases.pl

@@ -246,8 +246,10 @@ sub collect_test_cases ($) {
 	push(@criteria, "ndb=" . ($tinfo->{'ndb_test'} ? "1" : "0"));
 	# Group test with equal options together.
 	# Ending with "~" makes empty sort later than filled
-	push(@criteria, join("!", sort @{$tinfo->{'master_opt'}}) . "~");
-
+	if ( $tinfo->{'master_opt'}[0] )
+	{
+	  push(@criteria, join("!", sort @{$tinfo->{'master_opt'}}) . "~");
+	}
 	$sort_criteria{$test_name} = join(" ", @criteria);
       }
     }