message: fix mtx_reader on pattern type matrix
diff: @@ -121,6 +121,9 @@ public:
  "MMIO: unable to read value for matrix position " +
  to_string(row) + ", " + to_string(col));
  }
  + } else {
  + // pattern: the value is 1 (True)
  + rp = 1.0;
  }
  data.nonzeros.emplace_back(row, col, combine<ValueType>(rp, ip));
  if (mm_is_symmetric(t_) && row != col) {
  