Broken/missing handler on Custom Block Library view

Problem/Motivation

Broken/missing handler on Custom Block Library view - Drupal 8.0.3

Steps to reproduce:

1. simplytest.me or manual test Drupal 8.0.3. Both tested.
2. Use standard or minimal install profile. Both tested.
3. Land on front page: Congrats... drupal is installed.
4. Go to admin/structure/views/block-content or admin/structure/views and click "Edit" the Custom Block Library view
5. Look at Filter Criteria: See broken/missing handler. https://rm8yx.ply.st/admin/structure/views/nojs/handler/block_content/pa...

Do the same steps on 8.0.0-rc1 and no broken/missing handler message displayed.

Steps to reproduce log messages:

1. Click on broken/missing handler link.
2. Save all displays
3. Close window.
4. Go to admin/reports/recent log messages

Undefined index: field in Drupal\views\Plugin\ViewsHandlerManager->getHandler() (line 88 of core/modules/views/src/Plugin/ViewsHandlerManager.php).
Undefined index: table in Drupal\views\Plugin\ViewsHandlerManager->getHandler() (line 87 of core/modules/views/src/Plugin/ViewsHandlerManager.php).
Undefined index: id in Drupal\views\Plugin\views\display\DisplayPluginBase->getHandlers() (line 862 of core/modules/views/src/Plugin/views/display/DisplayPluginBase.php).

/**
* Fetches a handler from the data cache.
*
* @param array $item
* An associative array representing the handler to be retrieved:
* - table: The name of the table containing the handler.
* - field: The name of the field the handler represents.
* @param string|null $override
* (optional) Override the actual handler object with this plugin ID. Used for
* aggregation when the handler is redirected to the aggregation handler.
*
* @return \Drupal\views\Plugin\views\ViewsHandlerInterface
* An instance of a handler object. May be a broken handler instance.
*/
public function getHandler($item, $override = NULL) {
$table = $item['table']; line 87
$field = $item['field']; line 88

/**
* {@inheritdoc}
*/
public function &getHandlers($type) {
if (!isset($this->handlers[$type])) {
$this->handlers[$type] = array();
$types = ViewExecutable::getHandlerTypes();
$plural = $types[$type]['plural'];

// Cast to an array so that if the display does not have any handlers of
// this type there is no PHP error.
foreach ((array) $this->getOption($plural) as $id => $info) {
// If this is during form submission and there are temporary options
// which can only appear if the view is in the edit cache, use those
// options instead. This is used for AJAX multi-step stuff.
if ($this->view->getRequest()->request->get('form_id') && isset($this->view->temporary_options[$type][$id])) {
$info = $this->view->temporary_options[$type][$id];
}

if ($info['id'] != $id) { line 862
$info['id'] = $id;

Proposed resolution

TBD

Remaining tasks

1. Find what has changed between 8.0.0-rc1 and 8.0.3 and update issue.
2. Seek input if needed to create a patch to fix the issue.

User interface changes

API changes

Data model changes