correctly handle situation when there are chats with all deleted msgs

.gitignore

@@ -1,4 +1,5 @@
 .mypy_cache/
+venv/
 __pycache__
 .env
 dist

tg/models/__init__.py

@@ -221,14 +221,17 @@ class MsgModel:
             log.info(f'message has been sent: {result.update}')
 
     def delete_msg(self, chat_id):
-        current_msg = self.current_msgs[chat_id]
-        msg = self.msgs[chat_id].pop(current_msg)
-        log.info(f"Deleting msg {msg}")
-
-        message_ids = [msg["id"]]
+        if chat_id is None:
+            return False
+        selected_msg = self.current_msgs[chat_id]
+        msg_item = self.msgs[chat_id].pop(selected_msg)
+        self.current_msgs[chat_id] = min(
+            selected_msg, len(self.msgs[chat_id]) - 1
+        )
+        log.info(f"Deleting msg from the chat {chat_id}: {msg_item}")
+        message_ids = [msg_item["id"]]
         r = self.tg.delete_messages(chat_id, message_ids, revoke=True)
-        r.wait(raise_exc=True)
-        self.current_msgs[chat_id] -= 1
+        r.wait()
         return True
 
 

tg/views/__init__.py

@@ -304,7 +304,10 @@ class MsgView:
 
 
 def get_last_msg(chat):
-    content = chat['last_message']['content']
+    last_msg = chat.get('last_message')
+    if not last_msg:
+        return "<No messages yet>"
+    content = last_msg['content']
     _type = content['@type']
     if _type == 'messageText':
         return content['text']['text']
@@ -312,7 +315,10 @@ def get_last_msg(chat):
 
 
 def get_date(chat):
-    dt = datetime.fromtimestamp(chat['last_message']['date'])
+    last_msg = chat.get('last_message')
+    if not last_msg:
+        return "<NA>"
+    dt = datetime.fromtimestamp(last_msg['date'])
     if datetime.today().date() == dt.date():
         return dt.strftime("%H:%M")
     return dt.strftime("%d/%b/%y")