send slack message only when slack token exists

scripts/app/test_internal_chain.py

@@ -90,8 +90,8 @@ async def process_block(blocks):
             # Increment the offset for the next query
             offset += current_limit
 
-        # The URL you want to send the data to
-        url = f'https://planetariumhq.slack.com/services/hooks/slackbot?token={config.slack_token}&channel=%23{config.slack_channel}'
-        data = f"[9C-INFRA] Finished testing `{network}` network from `#{original_offset}` to `#{tip_index}`."
-        headers = {'Content-Type': 'text/plain'}
-        response = requests.post(url, data=data, headers=headers)
+        if hasattr(config, 'slack_token') and config.slack_token:
+          url = f'https://planetariumhq.slack.com/services/hooks/slackbot?token={config.slack_token}&channel=%23{config.slack_channel}'
+          data = f"[9C-INFRA] Finished testing `{network}` network from `#{original_offset}` to `#{tip_index}`."
+          headers = {'Content-Type': 'text/plain'}
+          response = requests.post(url, data=data, headers=headers)