Bug 1376: Failure when a local drive is removed

https://winscp.net/tracker/1376

Source commit: 7c9aede749a9c4088038097a490dd3daf492c597

source/packages/filemng/DriveView.pas

@@ -1346,7 +1346,7 @@ begin
         if WasValid then
         {Drive has been removed => delete rootnode:}
         begin
-          if Directory[1] = Drive then
+          if (Directory <> '') and (Directory[1] = Drive) then
           begin
             Directory := NodePathName(DriveStatus[Drive].RootNode.GetPrevSibling);
             if not Assigned(Selected) then