fix: handle null item-meta in ConfigItemRenderer (#4269)

fixes: #4268

dashboard/src/components/shared/AstrBotConfig.vue

@@ -203,9 +203,8 @@ function hasVisibleItemsAfter(items, currentIndex) {
 
             <v-col cols="12" sm="6" class="config-input">
               <ConfigItemRenderer
-                v-if="metadata[metadataKey].items[key]"
                 v-model="iterable[key]"
-                :item-meta="metadata[metadataKey].items[key]"
+                :item-meta="metadata[metadataKey].items[key] || null"
                 :loading="loadingEmbeddingDim"
                 :show-fullscreen-btn="!!metadata[metadataKey].items[key]?.editor_mode"
                 @get-embedding-dim="getEmbeddingDimensions(iterable)"

dashboard/src/components/shared/AstrBotConfigV4.vue

@@ -219,7 +219,7 @@ function getSpecialSubtype(value) {
               <ConfigItemRenderer
                 v-else
                 v-model="createSelectorModel(itemKey).value"
-                :item-meta="itemMeta"
+                :item-meta="itemMeta || null"
                 :show-fullscreen-btn="!!itemMeta?.editor_mode"
                 @open-fullscreen="openEditorDialog(itemKey, iterable, itemMeta?.editor_theme, itemMeta?.editor_language)"
               />

dashboard/src/components/shared/ConfigItemRenderer.vue

@@ -223,7 +223,7 @@ const props = defineProps({
   },
   itemMeta: {
     type: Object,
-    required: true
+    default: null
   },
   loading: {
     type: Boolean,