Fixed an issue where null storage engines appeared when querying INFO…

…RMATION_SCHEMA.

mysqltuner.pl

@@ -429,7 +429,7 @@ sub check_storage_engines {
 	print "$engines\n";
 	if ($mysqlvermajor >= 5) {
 		# MySQL 5 servers can have table sizes calculated quickly from information schema
-		my @templist = `mysql $mysqllogin -Bse "SELECT ENGINE,SUM(DATA_LENGTH),COUNT(ENGINE) FROM information_schema.TABLES WHERE TABLE_SCHEMA NOT IN ('information_schema','mysql') GROUP BY ENGINE ORDER BY ENGINE ASC;"`;
+		my @templist = `mysql $mysqllogin -Bse "SELECT ENGINE,SUM(DATA_LENGTH),COUNT(ENGINE) FROM information_schema.TABLES WHERE TABLE_SCHEMA NOT IN ('information_schema','mysql') AND ENGINE IS NOT NULL GROUP BY ENGINE ORDER BY ENGINE ASC;"`;
 		foreach my $line (@templist) {
 			my ($engine,$size,$count);
 			($engine,$size,$count) = $line =~ /([a-zA-Z_]*)\s+(\d+)\s+(\d+)/;