Extract nested collection child fieldsets
add space
Add CanBindObjectAndPopulateAndExtractNestedFieldsets test
Suit PSR-2 coding style
Merge branch 'hotfix/5301'

Close #5301
Merge pull request #5093 from thestanislav/fix/collection

Extract and populate values for nested fieldsets in Collection elements
Merge branch 'hotfix/5093' into develop

Forward port #5093