Make sure local dev still works with sentry

app/app.py

@@ -174,6 +174,7 @@ def create_app():
 
 # For usage when you directly call the script with python
 if __name__ == "__main__":
+    if Configuration.SENTRY_DSN:
         sentry_sdk.init(
             dsn=Configuration.SENTRY_DSN,
             integrations=[FlaskIntegration()]

app/config.example.py

@@ -12,6 +12,6 @@ class Configuration:
     SECRET_KEY = "<change>"
     SLACK_WEBHOOK = None
     LOGFILE = "haldis.log"
-    SENTRY_DSN = "<change>"
+    SENTRY_DSN = None
     ZEUS_KEY = "tomtest"
     ZEUS_SECRET = "blargh"