Check if the master key is missing before returning an error

meilisearch-http/src/extractors/authentication/mod.rs

@@ -31,11 +31,14 @@ impl<P, D> GuardedData<P, D> {
     where
         P: Policy + 'static,
     {
+        let missing_master_key = auth.get_master_key().is_none();
+
         match Self::authenticate(auth, token, index).await? {
             Some(filters) => match data {
                 Some(data) => Ok(Self { data, filters, _marker: PhantomData }),
                 None => Err(AuthenticationError::IrretrievableState.into()),
             },
+            None if missing_master_key => Err(AuthenticationError::MissingMasterKey.into()),
             None => Err(AuthenticationError::InvalidToken.into()),
         }
     }