Fix(llm): Do not try to process an email without message contents

Author: andris9

lib/mailbox.js

@@ -1088,7 +1088,7 @@ class Mailbox {
         if (messageInfo.messageSpecialUse === '\\Inbox' && (!this.connection.notifyFrom || messageData.internalDate >= this.connection.notifyFrom)) {
             let messageData = Object.assign({ account: this.connection.account }, messageInfo);
 
-            let canUseLLM = await llmPreProcess.run(messageData);
+            let canUseLLM = (await llmPreProcess.run(messageData)) && messageInfo.text;
 
             if (canUseLLM && (messageInfo.text.plain || messageInfo.text.html)) {
                 if (canUseLLM.generateEmailSummary) {