Merge PR #578 into core

Author: Anthropic

lib/schemaDefaults.js

@@ -159,6 +159,7 @@ export function fieldset(name, schema, options, defaultFormDef) {
   if (stripNullType(schema.type) === 'object') {
     const f   = stdFormObj(name, schema, options);
     f.type  = 'fieldset';
+    f.key  = options.path;
     f.items = [];
     options.lookup[stringify(options.path)] = f;
 
@@ -260,8 +261,8 @@ export function defaultForm(schema, defaultSchemaTypes, ignore, globalOptions) {
         }
       }
     });
-
-  } else {
+  }
+  else {
     throw new Error('Not implemented. Only type "object" allowed at root level of schema.');
   }
   return { form: form, lookup: lookup };