take into account 'if type absent type can be any'.

so user can choose type if type absent

jsonform/gadget_json_generated_form_child.js

@@ -318,7 +318,7 @@
 
   function checkSchemaArrOneChoise(schema_arr) {
     if (schema_arr.length === 1) {
-      if (schema_arr[0].schema === true) {
+      if (schema_arr[0].schema === true || !schema_arr[0].schema.hasOwnProperty('type')) {
         return false;
       }
       if (schema_arr[0].schema.type instanceof Array) {
@@ -433,7 +433,7 @@
         for (i = 0; i < schema_arr.length; i += 1) {
           schema_item = schema_arr[i];
           description = schema_item.title;
-          if (schema_item.schema === true) {
+          if (schema_item.schema === true || !schema_item.schema.hasOwnProperty('type')) {
             generateItemsForAny(schema_item.property_name, schema_item.schema_path);
           } else if (getDocumentType(schema_item.schema.type) === "array") {
             description = description || schema_item.schema.description;