only process attachments if they exist

SignalServiceKit/src/Devices/OWSRecordTranscriptJob.m

@@ -175,6 +175,7 @@ NS_ASSUME_NONNULL_BEGIN
     [self.readReceiptManager applyEarlyReadReceiptsForOutgoingMessageFromLinkedDevice:outgoingMessage
                                                                           transaction:transaction];
 
+    if (outgoingMessage.hasAttachments) {
         [self.attachmentDownloads
             downloadAttachmentsForMessage:outgoingMessage
                               transaction:transaction
@@ -183,6 +184,7 @@ NS_ASSUME_NONNULL_BEGIN
                                       OWSLogError(
                                           @"failed to fetch transcripts attachments for message: %@", outgoingMessage);
                                   }];
+    }
 }
 
 @end