feat: remove empty memoryPrompt in ChatMessages

app/store/chat.ts

@@ -428,14 +428,13 @@ export const useChatStore = createPersistStore(
       getMemoryPrompt() {
         const session = get().currentSession();
 
-        return {
-          role: "system",
-          content:
-            session.memoryPrompt.length > 0
-              ? Locale.Store.Prompt.History(session.memoryPrompt)
-              : ";",
-          date: "",
-        } as ChatMessage;
+        if (session.memoryPrompt.length) {
+          return {
+            role: "system",
+            content: Locale.Store.Prompt.History(session.memoryPrompt),
+            date: "",
+          } as ChatMessage;
+        }
       },
 
       getMessagesWithMemory() {
@@ -471,16 +470,15 @@ export const useChatStore = createPersistStore(
             systemPrompts.at(0)?.content ?? "empty",
           );
         }
-
+        const memoryPrompt = get().getMemoryPrompt();
         // long term memory
         const shouldSendLongTermMemory =
           modelConfig.sendMemory &&
           session.memoryPrompt &&
           session.memoryPrompt.length > 0 &&
           session.lastSummarizeIndex > clearContextIndex;
-        const longTermMemoryPrompts = shouldSendLongTermMemory
-          ? [get().getMemoryPrompt()]
-          : [];
+        const longTermMemoryPrompts =
+          shouldSendLongTermMemory && memoryPrompt ? [memoryPrompt] : [];
         const longTermMemoryStartIndex = session.lastSummarizeIndex;
 
         // short term memory
@@ -605,9 +603,11 @@ export const useChatStore = createPersistStore(
             Math.max(0, n - modelConfig.historyMessageCount),
           );
         }
-
-        // add memory prompt
-        toBeSummarizedMsgs.unshift(get().getMemoryPrompt());
+        const memoryPrompt = get().getMemoryPrompt();
+        if (memoryPrompt) {
+          // add memory prompt
+          toBeSummarizedMsgs.unshift(memoryPrompt);
+        }
 
         const lastSummarizeIndex = session.messages.length;