Remove null checks for arrays/collections

[Yarikx]

Null helpers (that are used for arrays/collections) fields can be removed and replaced with direct calls (create*Array, create*List).

As I understand the only reason for this helpers is to safely save and read null values for collection fields.
But such combinations as write*Array/create*Array support nulls by default.

[sockeqwe]

Correct, I will fix that!