bin/hilbert in hilbert-0.0.2700400 vs bin/hilbert in hilbert-0.0.2700410

@@ -23,9 +23,10 @@
     begin
       input = $stdin.gets
       output = Hilbert::Iq.execute(input)
       $stdout.puts output
     rescue => e
+      break unless input
       puts e
     end
   end
 when '-v'
   puts Hilbert::VERSION