fix: dev: [apache] fix merging error when no configuration is provided in relation.

apache/lib/common

@@ -61,12 +61,14 @@ export -f apache_publish_dir
 ##
 
 
-
 apache_vhost_create() {
-    local type="$1" cfg="$2" protocols="$3" dest="$4" custom_rules vhost_statement creds
+    local type="$1" cfg="$2" protocols="$3" dest="$4" custom_rules vhost_statement creds \
+          redirect domain ssl_plugin_fun ssl_cfg_value ssl_cfg_options
 
     export APACHE_CONFIG_LOCATION="$SERVICE_CONFIGSTORE/etc/apache2/sites-enabled"
-
+    if [ "$cfg" == "None" ]; then
+        cfg=
+    fi
     if [ -z "$protocols" ]; then
         protocols=$(__vhost_cfg_normalize_protocol "$cfg") || return 1
     fi
@@ -105,7 +107,7 @@ $(if [ "$custom_rules" ]; then
                 cfg=$(merge_yaml_str "$cfg" "$(yaml_key_val_str "apache-custom-rules" "$redirect_rule
 $(if [ "$custom_rules" ]; then
     echo "- |"$'\n'"$(echo "$custom_rules" | prefix "  ")"
-  fi)")")
+  fi)")") || return 1
             fi
             [ "$RELATION_DATA_FILE" ] && \
                 relation-set protocol https