CMS-1443 Focus when loading new forms

Following behaviour was implemented

::Display Name Script exists

    Create content
        Set focus on first input in form
    Edit content
        Set forcus on first input in form

:: Display name script does not exist

    Create content
        Set focus on display name
    Edit content
        Set focus first input in form
CMS-1443 Focus when loading new forms

Fix error thrown for FieldSetLayout during form generation.
Merge pull request #197 from enonic/CMS-1443

CMS-1443 Focus when loading new forms