An error is reported when tapping nil element

[electricbubble]

952ed2a#diff-ef2b007ff2cf5811194b985ca21d2a23R63-R65

This snippet of code affects handleTap.

https://github.com/appium/WebDriverAgent/blob/master/WebDriverAgentLib/Commands/FBElementCommands.m#L404-L421

It's impossible that the condition is YES.

  if (nil == element) {
    XCUICoordinate *tapCoordinate = [self.class gestureCoordinateWithCoordinate:tapPoint application:request.session.activeApplication shouldApplyOrientationWorkaround:isSDKVersionLessThan(@"11.0")];
    [tapCoordinate tap];
  }

--> POST http://__UDID__/session/FDCC5F83-810A-4DA7-9165-6F2CE84BB565/wda/tap/0
{"x":230,"y":130}

<-- POST http://__UDID__/session/FDCC5F83-810A-4DA7-9165-6F2CE84BB565/wda/tap/0
{
  "value" : {
    "error" : "stale element reference",
    "message" : "The previously found element \"0\" is not present on the current page anymore",
    "traceback" : "(\n\t0   CoreFoundation                      ....)"
  },
  "sessionId" : "FDCC5F83-810A-4DA7-9165-6F2CE84BB565"
}