[patch] handle edge case when additional channel is empty

Author: terc1997

.secrets.baseline

@@ -3,7 +3,7 @@
     "files": "^.secrets.baseline$",
     "lines": null
   },
-  "generated_at": "2025-12-10T20:44:32Z",
+  "generated_at": "2025-12-11T13:22:20Z",
   "plugins_used": [
     {
       "name": "AWSKeyDetector"
@@ -82,15 +82,15 @@
         "hashed_secret": "053f5ed451647be0bbb6f67b80d6726808cad97e",
         "is_secret": false,
         "is_verified": false,
-        "line_number": 54,
+        "line_number": 55,
         "type": "Secret Keyword",
         "verified_result": null
       },
       {
         "hashed_secret": "4f75456d6c1887d41ed176f7ad3e2cfff3fdfd91",
         "is_secret": false,
         "is_verified": false,
-        "line_number": 63,
+        "line_number": 64,
         "type": "Secret Keyword",
         "verified_result": null
       }

bin/mas-devops-notify-slack

@@ -35,8 +35,9 @@ def _broadcast(channels: str, message: list):
     responses = []
     for channel in channelList:
         try:
-            response = SlackUtil.postMessageBlocks(channel, message)
-            responses.append(response.data.get("ok", False))
+            if channel:
+                response = SlackUtil.postMessageBlocks(channel, message)
+                responses.append(response.data.get("ok", False))
         except Exception as e:
             print(f"Failed to send message to channel {channel}: {e}")
             responses.append(False)