Don't apply join when DateFilter has no actual filter values submitted

Due to how it is implemented, DateFilter applies an inner join on nested properties even if no filters are provided. This is a problem for GraphQL where you have to define your variables for the query upfront, so ApiPlatform sees the filter in the query and applies the join, but no actual fields and filtering value is supplied

Author: psihius

src/Doctrine/Orm/Filter/DateFilter.php

@@ -153,7 +153,7 @@ protected function filterProperty(string $property, $values, QueryBuilder $query
         $alias = $queryBuilder->getRootAliases()[0];
         $field = $property;
 
-        if ($this->isPropertyNested($property, $resourceClass)) {
+        if ($this->isPropertyNested($property, $resourceClass) && count($values) > 0) {
             [$alias, $field] = $this->addJoinsForNestedProperty($property, $alias, $queryBuilder, $queryNameGenerator, $resourceClass, Join::INNER_JOIN);
         }