Fixes core block placement: Issue 931 (#99 An error occurred )

* Form altering out our custom Conditions, which don't play well with Core block placement

* Diagnosing Travis

* Coding standards

* Reverting .travis.yml

islandora.module

@@ -15,6 +15,7 @@
  */
 
 use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Form\FormStateInterface;
 use Drupal\node\NodeInterface;
 use Drupal\media\MediaInterface;
 use Drupal\file\FileInterface;
@@ -322,3 +323,20 @@ function islandora_entity_form_display_alter(&$form_display, $context) {
     }
   }
 }
+
+/**
+ * Implements hook_form_form_id_alter().
+ */
+function islandora_form_block_form_alter(&$form, FormStateInterface $form_state, $form_id) {
+  // Unset our custom conditions.  There's too many to use well within
+  // the core block placement UI, and no other reasonable way to filter
+  // them out.  See https://www.drupal.org/node/2284687.  Use
+  // /admin/structure/context instead if you want to use these conditions
+  // to alter block layout.
+  unset($form['visibility']['content_entity_type']);
+  unset($form['visibility']['parent_node_has_term']);
+  unset($form['visibility']['media_has_term']);
+  unset($form['visibility']['file_uses_filesystem']);
+  unset($form['visibility']['node_has_term']);
+  unset($form['visibility']['media_uses_filesystem']);
+}