Suppress writing to nohup.out when invoking external apps.

App.py

@@ -221,10 +221,13 @@ class Links(urwid.ListBox):
     def parseLink(self, link):
         ext = link.split(".")[-1]
         if ext.lower() in ("jpg", "jpeg", "gif", "png", "tif", "tiff"):
-            os.system('nohup feh ' + link + ' 2>/dev/null &')
+            os.system('nohup feh ' + link + ' </dev/null >/dev/null 2>&1 &')
         elif Utils.checkStreamingVideo(link):
             tui.destroyOverlay()
-            os.system('nohup mpv --ytdl-format="bestvideo[height<=720]+bestaudio/best[height<=720]" "' + link + '" 2>/dev/null &')
+            os.system(
+                'nohup mpv --ytdl-format="bestvideo[height<=720]+bestaudio/best[height<=720]" "' +
+                link +
+                '" </dev/null >/dev/null 2>&1 &')
         else:
             subprocess.Popen(['firefox', '-new-tab', link])