Bug fixed for Zero coefficient in goal

    //**/debug_names = &index2name;

    //**/reportf("MIN: "); dump(ps, Cs); reportf("\n");

  assert(ps.size() == Cs.size());

  assert(ps.size() > 0);

  //if (ps.size() == 0) return;

  assert(ps.size() >= 0);

  // GCD;

  vec<Int> norm_Cs;

  if(opt_goal_gcd) {

    assert(Cs[0] != 0);

    if(Cs[0] < 0) goal_coeff = -Cs[0]; else goal_coeff = Cs[0];

    for (int i = 1; i < Cs.size(); i++) {

      assert(Cs[i] != 0);

    int i = 0; bool emptyGoal = true;

    for (; i < Cs.size(); i++) {

      if(Cs[i] != 0) {

        if(Cs[i] < 0) goal_coeff = -Cs[i]; else goal_coeff = Cs[i];

	emptyGoal = false;

	break;

      }

    } reportf("i=%d\n",i);

    if(!emptyGoal)

      for (; i < Cs.size(); i++) {

        if(Cs[i] < 0) goal_coeff = gcdg(goal_coeff, -Cs[i]);

      else goal_coeff = gcdg(goal_coeff, Cs[i]);

        else if(Cs[i] > 0) goal_coeff = gcdg(goal_coeff, Cs[i]);

      }

    else goal_coeff = 1;

  } else goal_coeff = 1;

  if(opt_verbosity >=1 )