Match value of exclude-data option

dbackup

@@ -456,7 +456,7 @@ sub backup
 			}
 		}
 		# Check if we excluding data dirs
-		if (defined($config{'exclude-data'})) {
+		if ($config{'exclude-data'}) {
 			# Loop through system dirs
 			foreach my $sysdir (@{$config{'system-base'}}) {
 				# Loop with data dirs