Fix html2haml.

doc-src/HAML_CHANGELOG.md

@@ -10,6 +10,8 @@
 
 * Don't throw errors when text is nested within comments.
 
+* Fix html2haml.
+
 ## 3.1.1
 
 * Update the vendored Sass to version 3.1.0.

lib/haml/exec.rb

@@ -9,7 +9,7 @@ module Haml
       # @param args [Array<String>] The command-line arguments
       def initialize(args)
         @args = args
-        @options = {}
+        @options = {:for_engine => {}}
       end
 
       # Parses the command-line arguments and runs the executable.