handle case where empty encodings hash

chuckremes · chuckremes · commit 3bd3998d1eb7 · 2016-07-06T10:44:03.000-05:00
diff --git a/core/io.rb b/core/io.rb
@@ -3393,7 +3393,7 @@ def write(data)
         data.encode!(external_encoding)
       end
     end
-    data.encode!(@encoding_options) unless @encoding_options.empty?
+    data.encode!(@encoding_options) unless (@encoding_options || {}).empty?
 
     #    if @sync
     @fd.write(data)
