Fix eav form foreach error #21134

[wojtekn]

Description

PR adds missing initialization for two class variables which can be returned by class methods as parameters of type array. Without this initialization they are return as null what can result in throwing "Invalid argument supplied for foreach()" warning.

Fixed Issues

1. #21134

Manual testing scenarios (*)

1. ...
2. ...

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

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