Update View_Alter.php

Fix #171: Notice: Undefined index: #entity in Drupal\at_base\Hook\Entity\View_Alter
Update Views_Base.php

Twig > Filters > Fix error when no default ID is set.
Update BlockView.php

Handle content-render's exception.
Fix #173: at_ui.module: Inline sourcode viewer.
Merge branch 'dev-master' into site/crom

* dev-master:
  Fix #173: at_ui.module: Inline sourcode viewer.
  Update BlockView.php
  Update Views_Base.php
  Update View_Alter.php