a space is needed

a space is needed

bin/v-add-firewall-rule

@@ -52,7 +52,7 @@ is_system_enabled "$FIREWALL_SYSTEM" 'FIREWALL_SYSTEM'
 get_next_fw_rule
 validate_format 'rule'
 is_object_new '../../data/firewall/rules' 'RULE' "$rule"
-if [ ! -z "$comment"]; then
+if [ ! -z "$comment" ]; then
     validate_format 'comment'
 fi