Change native return type for getQuery

Author: alexander-schranz

src/PHPCR/Util/QOM/QueryBuilder.php

@@ -399,10 +399,8 @@ public function joinWithType(SourceInterface $rightSource, string $joinType, Joi
 
     /**
      * Gets the query built.
-     *
-     * @return QueryObjectModelInterface
      */
-    public function getQuery(): ?QueryObjectModelInterface
+    public function getQuery(): QueryObjectModelInterface
     {
         if (null !== $this->query && self::STATE_CLEAN === $this->state) {
             return $this->query;