show initial null value

java/debugger/impl/src/com/intellij/debugger/engine/JavaValueModifier.java

@@ -1,18 +1,4 @@
-/*
- * Copyright 2000-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.intellij.debugger.engine;
 
 import com.intellij.debugger.DebuggerBundle;
@@ -51,7 +37,7 @@ public abstract class JavaValueModifier extends XValueModifier {
   @Override
   public void calculateInitialValueEditorText(final XInitialValueCallback callback) {
     final Value value = myJavaValue.getDescriptor().getValue();
-    if (value instanceof PrimitiveValue) {
+    if (value == null || value instanceof PrimitiveValue) {
       String valueString = myJavaValue.getValueString();
       int pos = valueString.lastIndexOf('('); //skip hex presentation if any
       if (pos > 1) {