need to allow empty strings when a string property has a format

src/lib.rs

@@ -157,7 +157,11 @@ fn validate_json_schema(schema_id: &str, instance: JsonB) -> JsonB {
           let errors = format_errors(error_list, &instance_value, schema_id);
           // Filter out FALSE_SCHEMA errors if there are other validation errors
           let filtered_errors = filter_false_schema_errors(errors);
-          JsonB(json!({ "errors": filtered_errors }))
+          if filtered_errors.is_empty() {
+            JsonB(json!({ "response": "success" }))
+          } else {
+            JsonB(json!({ "errors": filtered_errors }))
+          }
         }
       }
     }
@@ -486,6 +490,13 @@ fn handle_additional_items_error(base_path: &str, got: usize) -> Vec<Error> {
 }
 
 fn handle_format_error(base_path: &str, want: &str, got: &Cow<Value>, err: &Box<dyn std::error::Error>) -> Vec<Error> {
+  // If the value is an empty string, skip format validation.
+  if let Value::String(s) = got.as_ref() {
+    if s.is_empty() {
+      return vec![];
+    }
+  }
+
   vec![Error {
     path: base_path.to_string(),
     code: "FORMAT_INVALID".to_string(),