Handle two possible emoji in a row

lib/rumoji.rb

@@ -26,7 +26,7 @@ module Rumoji
       last_emoji = previous_emoji.pop
 
       sequence =  if last_emoji.nil? || !last_emoji.codepoints.include?(codepoint)
-                    if possible_emoji.empty?
+                    if possible_emoji.empty? || last_emoji
                       last_codepoint = last_emoji && last_emoji.codepoints.first
                       sequence_codepoints = [last_codepoint, codepoint].compact
                       sequence_codepoints.pack("U" * sequence_codepoints.size)

spec/rumoji_spec.rb

@@ -31,7 +31,7 @@ describe Rumoji do
     end
 
     it "keeps codepoints that match the beginnings of multi-codepoint emoji" do
-      text = "i like #hashtags and 1direction"
+      text = "i like #hashtags and 1direction they are the #1 band"
       io   = StringIO.new(text)
 
       Rumoji.encode_io(io).string.must_equal text