HHH-15850 Check if escape character is null in QuerySplitter

hibernate-core/src/main/java/org/hibernate/query/hql/internal/QuerySplitter.java

@@ -913,6 +913,8 @@ public class QuerySplitter {
 			return new SqmLikePredicate(
 					(SqmExpression<?>) predicate.getMatchExpression().accept( this ),
 					(SqmExpression<?>) predicate.getPattern().accept( this ),
+					predicate.getEscapeCharacter() == null ?
+							null :
 							(SqmExpression<?>) predicate.getEscapeCharacter().accept( this ),
 					predicate.nodeBuilder()
 			);