Recovery for initializer if no LBRACE

- If no LBRACE after 'init' keyword parse initializer without body
- Made getBody() nullable, appropriate checks added

js/js.translator/src/org/jetbrains/kotlin/js/translate/initializer/InitializerVisitor.java

@@ -58,7 +58,10 @@ public final class InitializerVisitor extends TranslatorVisitor<Void> {
 
     @Override
     public Void visitAnonymousInitializer(@NotNull JetClassInitializer initializer, @NotNull TranslationContext context) {
-        result.add(translateAsStatementAndMergeInBlockIfNeeded(initializer.getBody(), context));
+        JetExpression initializerBody = initializer.getBody();
+        if (initializerBody != null) {
+            result.add(translateAsStatementAndMergeInBlockIfNeeded(initializerBody, context));
+        }
         return null;
     }