Don't send message to nonexisting windows.
SVN revision: 15173
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@ -1352,6 +1352,8 @@ ecore_x_netwm_sync_request_send(Ecore_X_Window win, unsigned int serial)
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XSyncValue value;
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XEvent xev;
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if (!win) return;
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XSyncIntToValue(&value, serial);
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xev.xclient.type = ClientMessage;
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