Description of problem:
When you click the 'Add all remaining data holder fields' in 'Add fields by origin' section of Form modeler no field is added to the form.

Version-Release number of selected component (if applicable):
BPMS 6.0.0.CR1 deployed on EAP 6.1

How reproducible:
Always

Steps to Reproduce:

See video attachment for reproducing steps. Textual description of steps for your reference:
1. First open some project with existing Data Model items (POJO class created by Data modeller) - for example repo: uf-playground, project: mortgates
2. Create new form using New Item > New form
3. In form data origin select 'from data model' > Applicant, fill in some Id and output id > click Add data holder
4. Go to Add fields by origin
5. Click the ">" titled 'Add all remaining data holder fileds' for our data origin class

Actual results:
no field is added. Although it is possible to add fields one by one, adding all at once is not working. There's no exception in server.log.

Expected results:
All fields from data holder should be added to form canvas.