Issue #3496295: Undefined property: DependencyHelper::

Closes #3496295

src/DependencyHelper.php

@@ -153,6 +153,7 @@ class DependencyHelper {
    * Resolve a bundle's dependencies.
    */
   protected function resolveBundleDependencies($dependent_fields) {
+    $this->dependencies[$this->entityType][$this->bundle] = [];
     foreach ($dependent_fields as $dependent => $field) {
       $this->dependent = $dependent;
       $this->dependentField = $field;