Add function and prefer .iter()

src/handlers/mod.rs

@@ -21,7 +21,7 @@ impl Serialize for EmgauwaJsonPayLoadError {
             "description",
             &match self {
                 EmgauwaJsonPayLoadError::Error(err) => format!("{}", err),
-            }
+            },
         )?;
         s.end()
     }