small updates

app.py

@@ -337,8 +337,6 @@ async def v1_mars_report(request: Request) -> Response:
         report = MarsReport.load(request_json, unknown=EXCLUDE)
         emails = await BOT.handle_mars_report(channel_id, report)
         Log.d(TAG, f"v1_mars_report::notification: '{emails}'")
-        data = None
-        if isinstance(emails, list) and len(emails) > 0:
         data = {"data": emails}
         return make_response(200, "OK", data)
     except Exception:

bots/messaging_extension_action_preview_bot.py

@@ -143,7 +143,7 @@ class TeamsMessagingExtensionsActionPreviewBot(TeamsActivityHandler):
                 ).members.get()
                 emails = []
                 for member in response.value:
-                    if member.mail is not None:
+                    if member.mail:
                         emails.append(member.mail)
                 future.set_result(emails)