[Orm] Uncaught ErrorException if EntityCollection->getById() called with invalid id

[avolutions]

Describe the bug
If EntityCollection->getById() is called with a not existing id, the following exception is thrown:

Uncaught ErrorException: Undefined array key 0

The method should return null (like getFirst()) instead of throwing an exception.

To Reproduce

1. Create a model, mapping and EntityCollection
2. Call EntityCollection->getById() and pass a not existing id

Additional information
AVOLUTIONS version: 0.9.0-alpha
PHP version: 8.0