wasm: NetworkReply with empty data generates runtimeError

on firefox, a PUT request with a response with a 0 content-length generates a critical error and exit the application:

Application exit (RuntimeError: integer divide by zero)

in file:

qtbase/src/network/access/qnetworkreplywasmimpl.cpp

in function

void QNetworkReplyWasmImplPrivate::emitDataReadProgress(qint64 bytesReceived, qint64 bytesTotal)

if we  replace

percentFinished = (bytesReceived / bytesTotal) * 100;

by

percentFinished = bytesTotal ? (bytesReceived / bytesTotal) * 100 : 100;

it fix the bug