Unify Handling of Setting to Null on DB

src/v3/mod.rs

@@ -1037,8 +1037,9 @@ pub(crate) async fn edit_empire(
             }
             else {
                 any_param_present = true;
+                let val: Option<String> = None;
                 db_empire_separated
-                    .push(" discord_user = NONE");
+                    .push(" discord_user = ").push_bind_unseparated(val);
             }
         }