getReaderNames(): handle SCARD_E_SERVICE_STOPPED on Windows

On Windows (at least W10) when you remove the last connected reader you
get the error SCARD_E_SERVICE_STOPPED.

We can just ignore the error since a new connection will be made on next
call to getReaderNames(). See db52d27

smartcard/pcsc/PCSCCardRequest.py

@@ -89,7 +89,9 @@ def getReaderNames(self):
 
         # get inserted readers
         hresult, pcscreaders = SCardListReaders(self.hcontext, [])
-        if 0 != hresult and SCARD_E_NO_READERS_AVAILABLE != hresult:
+        if hresult in [SCARD_E_NO_READERS_AVAILABLE, SCARD_E_SERVICE_STOPPED]:
+            return []
+        if SCARD_S_SUCCESS != hresult:
             raise ListReadersException(hresult)
 
         readers = []