[Autocomplete] Add throwing an exception when trying to set options when the form is already existing

Author: jakubtobiasz

src/Autocomplete/src/Form/WrappedEntityTypeAutocompleter.php

@@ -172,6 +172,10 @@ private function getEntityMetadata(): EntityMetadata
 
     public function setOptions(array $options): void
     {
+        if (null !== $this->form) {
+            throw new \LogicException('The options can only be set before the form is created.');
+        }
+
         $this->options = $options;
     }
 }