decompiler: do not fail on nested lambdas

src/org/jetbrains/java/decompiler/main/ClassesProcessor.java

@@ -354,7 +354,7 @@ public class ClassesProcessor {
     public int access;
     public String simpleName;
     public StructClass classStruct;
-    public ClassWrapper wrapper;
+    private ClassWrapper wrapper;
     public String enclosingMethod;
     public InvocationExprent superInvocation;
     public Map<String, VarVersionPair> mapFieldsToVars = new HashMap<String, VarVersionPair>();
@@ -419,6 +419,14 @@ public class ClassesProcessor {
       return null;
     }
 
+    public ClassWrapper getWrapper() {
+      ClassNode node = this;
+      while (node.type == CLASS_LAMBDA) {
+        node = node.parent;
+      }
+      return node.wrapper;
+    }
+
     public static class LambdaInformation {
       public String class_name;
       public String method_name;