Fix:_WD_GetElementFromPoint unchecked @error

[Danp2]

Pull request

Proposed changes

If the 'rect' _WD_ElementAction() call failed (e.g. a stale/detached frame element), it returns its documented "" failure sentinel, which was then immediately dereferenced via .Item('x')/.Item('y') with no @error check.

Calling a method on a String is a fatal AutoIt runtime error, killing the script instead of returning $_WD_ERROR_RetValue like every other failure path in this function.

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