fix(BaseProvider, KnowledgeService): Enhance getMessageContent() & getKnowledgeBaseReferences()

- handle empty message content

src/renderer/src/providers/BaseProvider.ts

@@ -93,6 +93,10 @@ export default abstract class BaseProvider {
   }
 
   public async getMessageContent(message: Message) {
+    if (isEmpty(message.content)) {
+      return message.content
+    }
+
     const webSearchReferences = await this.getWebSearchReferences(message)
 
     if (!isEmpty(webSearchReferences)) {
@@ -115,6 +119,9 @@ export default abstract class BaseProvider {
   }
 
   private async getWebSearchReferences(message: Message) {
+    if (isEmpty(message.content)) {
+      return []
+    }
     const webSearch: TavilySearchResponse = window.keyv.get(`web-search-${message.id}`)
 
     if (webSearch) {

src/renderer/src/services/KnowledgeService.ts

@@ -117,7 +117,7 @@ export const getKnowledgeBaseReference = async (base: KnowledgeBase, message: Me
 }
 
 export const getKnowledgeBaseReferences = async (message: Message) => {
-  if (isEmpty(message.knowledgeBaseIds)) {
+  if (isEmpty(message.knowledgeBaseIds) || isEmpty(message.content)) {
     return []
   }