Fix: Prevent __WD_CloseDriver closing all system processes

[Danp2]

Pull request

Proposed changes

_WD_Shutdown() defaults $vDriver to $_WD_DRIVER, which is "" if _WD_Startup() was never called.

__WD_CloseDriver then passed that empty string to ProcessList(""), which AutoIt treats as "no filter" and returns every running process on the system, each of which was then force-closed.

Skip the ProcessList() call when the stripped driver name is empty so no processes are closed instead.

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