LP Token estimation in fiat : Why an exception if prices are = 0 ?

[redDwarf03]

In DexTokensProviders.estimateTokenInFiat why have we an exception if prices are = 0
Normally, if tokens from LP have no price, LP Price = 0

  if (fiatValueToken1 == 0 && fiatValueToken2 == 0) {
    throw Exception();
  }