nautilus-files-view : Remove flashing empty folder view on toggling "show hidden files"

Karuna Grewal requested to merge antares/nautilus:wip/antares/hiddenFiles into master

Earlier on toggling "Show Hidden Files" in a empty folder flashed the empty folder view.
Now it's checked if the empty folder view is visible, depending on which the loading operation is invoked.
Fixes: #164 (closed)

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