Paranoia check in sendreplay().

See #926

plugins/eddn.py

@@ -6,6 +6,7 @@ import pathlib
 import re
 import sys
 import tkinter as tk
+import traceback
 from collections import OrderedDict
 from os import SEEK_SET
 from os.path import join
@@ -184,6 +185,12 @@ Msg:\n{msg}'''
 
         self.parent.update_idletasks()
 
+        # Paranoia check in case this function gets chain-called.
+        if not self.replaylog:
+            logger.error('self.replaylog is False after update_idletasks().  Traceback:\n'
+                         f'{"".join(traceback.format_list(traceback.extract_stack()))}')
+            return
+
         try:
             cmdr, msg = json.loads(self.replaylog[0], object_pairs_hook=OrderedDict)