Removed plugin manager code that enforces false module dependencies

Closes #3184470

src/ConditionManager.php

@@ -71,11 +71,6 @@ class ConditionManager extends DefaultPluginManager implements ConditionManagerI
         throw new PluginException(sprintf('The condition "%s" must define the "%s" property.', $plugin_id, $required_property));
       }
     }
-
-    $entity_type_id = $definition['entity_type'];
-    if (!$this->entityTypeManager->getDefinition($entity_type_id)) {
-      throw new PluginException(sprintf('The condition "%s" must specify a valid entity type, "%s" given.', $plugin_id, $entity_type_id));
-    }
   }
 
   /**