The problem not only occurs in nlhardwareinfo but also in cnet.podcast (and most likely many others).
In all cases it seems to be the Setinfo() which triggers the error:
File "/usr/lib/enigma2/python/Plugins/Extensions/KodiLite/plugins/plugin.video.cnet.podcasts/default.py", line 265, in add_dir
list_item.setInfo("mediatype", "video")
File "/usr/lib/enigma2/python/Plugins/Extensions/KodiLite/scripts/script.module.main/lib/xbmcgui.py", line 239, in setInfo
self.data.update(infoLabels)
ValueError: dictionary update sequence element #0 has length 1; 2 is required
Seems to be an invalid type of the second parameter or something ..
Since my knowledge of Python is basically non-existing, I can only give a solution here by modifying the plugin code. The 'real' solution should be in de KodiLite code obviously.
Solution (by modifying the plugin source):
# list_item.setInfo("mediatype", "video") -> replaced by next line
list_item.setInfo("video", {"mediatype": "video"})