Hide initial sections in forms

[donni106]

• added form helper that checks objets for presence of field values
  • therefore every form partials needs to define the fields that should be rendered and checked
• hide sections initially if empty using that new helper
• added js logic in nested form logics to make hidden sections visible
• dates form got a special force_visibility property now that is needed in launch form to render empty date fields
• linted ruby 's to "s

SVA-248