Fixed head is at end function

transition_machine/src/Config.cpp

@@ -735,7 +735,7 @@ bool Config::Tape::headIsAtEnd() const
   if (head >= ref.getLastIndex())
     return true;
 
-  return getHyp(1).empty();
+  return !getHyp(0).empty() && getHyp(1).empty();
 }
 
 int Config::Tape::size()