create absent collection node

create absent collection node

Merge pull request schmittjoh#675 from schmittjoh/xml-array

Fixed xml arrays with namespaced entry triggers error

Merge pull request schmittjoh#669 from schmittjoh/not-initialized-con…

…text

Groups context might be not initialized

Start with the 1.4.x branch

Merge pull request schmittjoh#630 from schmittjoh/revert-317-master

Revert "Default `$serializeNull` to false"

Merge pull request schmittjoh#625 from schmittjoh/mowcixo-master

Added public `hasData` function to check if a data key already have been added.

Merge pull request schmittjoh#595 from romantomchak/master

Fix xml-attribute-map for the xml driver

Merge pull request schmittjoh#510 from Soullivaneuh/yaml-empty-array

Manage empty array for serializer

fixes dependency for master