Fix changes from review of #1212.

src/beautifiers/hh_format.coffee

@@ -10,13 +10,21 @@ module.exports = class HhFormat extends Beautifier
   link: "http://hhvm.com/"
 
   options:
-    PHP: true
+    PHP: false
 
   beautify: (text, language, options) ->
     @run("hh_format", [
       @tempFile("input", text)
-      ]).then((output) =>
-        # hh_format can exit with status 0 and no output for some files which
-        # it doesn't format.  In that case we just return original text.
-        if output.trim() then output else text
-      )
+    ],
+    {
+      help: {
+        link: "http://hhvm.com/"
+      }
+    }).then((output) ->
+      # hh_format can exit with status 0 and no output for some files which
+      # it doesn't format.  In that case we just return original text.
+      if output.trim()
+        output
+      else
+        @Promise.resolve(new Error("hh_format returned an empty output."))
+    )