clang-format: [JS] Better support for empty function literals.

Before:
  SomeFunction(function(){});

After:
  SomeFunction(function() {});

llvm-svn: 217236
diff --git a/clang/unittests/Format/FormatTestJS.cpp b/clang/unittests/Format/FormatTestJS.cpp
index 55e7cc6..a4bd84a 100644
--- a/clang/unittests/Format/FormatTestJS.cpp
+++ b/clang/unittests/Format/FormatTestJS.cpp
@@ -167,6 +167,7 @@
 }
 
 TEST_F(FormatTestJS, FunctionLiterals) {
+  verifyFormat("doFoo(function() {});");
   verifyFormat("doFoo(function() { return 1; });");
   verifyFormat("var func = function() { return 1; };");
   verifyFormat("return {\n"