don't let the lookup return nil

huffman.rb

@@ -89,11 +89,11 @@ class HuffmanEncoding
   end
 
   def encode(entry)
-    self.lookup.invert[entry]
+    self.lookup.invert[entry] || ""
   end
 
   def decode(code)
-    self.lookup[code]
+    self.lookup[code] || ""
   end
 
   def encode_list(list)

thing.rb

@@ -21,7 +21,8 @@ end
 require './huffman'
 
 $log = Logger.new(STDERR)
-$log.level = Logger::DEBUG
+#$log.level = Logger::DEBUG
+$log.level = Logger::FATAL
 
 class BitWriter