fix sentry dsn default

registry/settings/base.py

@@ -234,9 +234,9 @@ CLAMD_TCP_ADDR = env.str("CLAMD_TCP_ADDR")
 
 # Sentry
 
-SENTRY_DSN = env.str("SENTRY_DSN")
+SENTRY_DSN = env.str("SENTRY_DSN", default="")
 
-if SENTRY_DSN is not None:
+if SENTRY_DSN != "":
     sentry_sdk.init(
         dsn=SENTRY_DSN,
         integrations=[DjangoIntegration()],