lib/treehash.rb in treehash-0.0.1 vs lib/treehash.rb in treehash-0.0.2

@@ -17,11 +17,13 @@
     shas = []
     while mega_byte = handle.read(MEGA_BYTE)
       shas << Digest::SHA256.new.digest(mega_byte)
     end
 
+    return nil if shas.empty?
+
     while shas.size > 1
-      shas = shas.each_slice(2).to_a.map do |pair|
+      shas = shas.each_slice(2).map do |pair|
         pair[1] ? Digest::SHA256.new.update(pair[0]).update(pair[1]).digest : pair[0]
       end
     end
 
     Digest.hexencode shas[0]