Issue #2369933 by amateescu: Fixed Remove references to an exception class...

Issue #2369933 by amateescu: Fixed Remove references to an exception class that doesn't exist (\Drupal\entity_reference\Exception\MissingDefaultValueException).

core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php

@@ -16,7 +16,6 @@
 use Drupal\Core\Field\FieldItemBase;
 use Drupal\Core\TypedData\DataDefinition;
 use Drupal\Core\TypedData\DataReferenceDefinition;
-use Drupal\entity_reference\Exception\MissingDefaultValueException;
 
 /**
  * Defines the 'entity_reference' entity field type.

core/modules/entity_reference/src/Tests/EntityReferenceIntegrationTest.php

@@ -9,7 +9,6 @@
 
 use Drupal\Component\Utility\String;
 use Drupal\config\Tests\AssertConfigEntityImportTrait;
-use Drupal\entity_reference\Exception\MissingDefaultValueException;
 use Drupal\field\Entity\FieldConfig;
 use Drupal\simpletest\WebTestBase;