message: allow for empty password
diff: @@ -835,6 +835,7 @@ String WiFiManager::toStringIp(IPAddress ip) {
  boolean WiFiManager::validApPassword(){
  // check that ap password is valid, return false
  + if (_apPassword == "") _apPassword = NULL;
  if (_apPassword != NULL) {
  if (strlen(_apPassword) < 8 || strlen(_apPassword) > 63) {
  DEBUG_WM(F("AccessPoint password is INVALID"));
  