add some null checks

to avoid bad error message from Criteria API

Author: gavinking

hibernate-core/src/main/java/org/hibernate/query/sqm/tree/predicate/SqmComparisonPredicate.java

@@ -13,7 +13,7 @@
 import org.hibernate.query.sqm.tree.SqmRenderContext;
 import org.hibernate.query.sqm.tree.expression.SqmExpression;
 
-
+import static java.util.Objects.requireNonNull;
 import static org.hibernate.query.sqm.internal.TypecheckUtil.assertComparable;
 
 /**
@@ -39,6 +39,12 @@ private SqmComparisonPredicate(
 			boolean negated,
 			NodeBuilder nodeBuilder) {
 		super( negated, nodeBuilder );
+
+		// CriteriaBuilder does not check its arguments, so check these here instead
+		requireNonNull( operator, "Operator must not be null" );
+		requireNonNull( leftHandExpression, "Left expression must not be null" );
+		requireNonNull( rightHandExpression, "Right expression must not be null" );
+
 		this.leftHandExpression = leftHandExpression;
 		this.rightHandExpression = rightHandExpression;
 		this.operator = operator;