kill JavaNamespaceDescriptor

compiler/backend/src/org/jetbrains/jet/codegen/JetTypeMapper.java

@@ -218,7 +218,11 @@ public class JetTypeMapper {
      *
      * @see DescriptorUtils#getFQName(DeclarationDescriptor)
      */
-    public String getFQName(DeclarationDescriptor descriptor) {
+    public String getFQName(@NotNull DeclarationDescriptor descriptor) {
+        if (descriptor instanceof ModuleDescriptor) {
+            throw new IllegalStateException("missed something");
+        }
+
         descriptor = descriptor.getOriginal();
 
         if(descriptor instanceof FunctionDescriptor) {
@@ -233,11 +237,8 @@ public class JetTypeMapper {
         if(name.contains("/"))
             return name;
         if (container != null) {
-            if (container.getContainingDeclaration() instanceof ModuleDescriptor) {
-                return name;
-            }
             if (container instanceof ModuleDescriptor) {
-                throw new IllegalStateException("missed something");
+                return "";
             }
             String baseName = getFQName(container);
             if (!baseName.isEmpty()) {