bug symfony#17668 add 'guid' to list of exception to filter out (garak)

This PR was squashed before being merged into the 2.3 branch (closes symfony#17668).

Discussion
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add 'guid' to list of exception to filter out

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#14583
| License       | MIT
| Doc PR        | none

See symfony#14583 (comment)

Commits
-------

0de86ff add 'guid' to list of exception to filter out

Author: fabpot

src/Symfony/Bridge/Doctrine/Form/ChoiceList/ORMQueryBuilderLoader.php

@@ -93,6 +93,13 @@ public function getEntitiesByIds($identifier, array $values)
             $values = array_values(array_filter($values, function ($v) {
                 return (string) $v === (string) (int) $v;
             }));
+        } elseif ('guid' === $metadata->getTypeOfField($identifier)) {
+            $parameterType = Connection::PARAM_STR_ARRAY;
+
+            // Like above, but we just filter out empty strings.
+            $values = array_values(array_filter($values, function ($v) {
+                return (string) $v !== '';
+            }));
         } else {
             $parameterType = Connection::PARAM_STR_ARRAY;
         }