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xmpp debug, please ignore added by C-Keen on Tue Mar 12 11:39:09 2019

Mar 12 12:15:36 datamanager     error   Unable to write to pep_eu.siacs.conversations.axolotl.bundles:1591018147 storage ('/var/lib/prosody/bobbel%2ensupdate%2einfo/pep_eu%2esiacs%2econversations%2eaxolotl%2ebundles%3a1591018147/ckeen.list~: No such file or directory' in <nil>) for user: ckeen@bobbel.nsupdate.info
Mar 12 12:15:36 bobbel.nsupdate.info:pep        error   Unable to set item: /var/lib/prosody/bobbel%2ensupdate%2einfo/pep_eu%2esiacs%2econversations%2eaxolotl%2ebundles%3a1591018147/ckeen.list~: No such file or directory
Mar 12 12:15:37 datamanager     error   Unable to write to pep_eu.siacs.conversations.axolotl.devicelist storage ('/var/lib/prosody/bobbel%2ensupdate%2einfo/pep_eu%2esiacs%2econversations%2eaxolotl%2edevicelist/ckeen.list~: No such file or directory' in <nil>) for user: ckeen@bobbel.nsupdate.info
Mar 12 12:15:37 bobbel.nsupdate.info:pep        error   Unable to set item: /var/lib/prosody/bobbel%2ensupdate%2einfo/pep_eu%2esiacs%2econversations%2eaxolotl%2edevicelist/ckeen.list~: No such file or directory
Mar 12 12:15:37 datamanager     error   Unable to write to pep_storage:bookmarks storage ('/var/lib/prosody/bobbel%2ensupdate%2einfo/pep_storage%3abookmarks/ckeen.list~: No such file or directory' in <nil>) for user: ckeen@bobbel.nsupdate.info
Mar 12 12:15:37 bobbel.nsupdate.info:pep        error   Unable to set item: /var/lib/prosody/bobbel%2ensupdate%2einfo/pep_storage%3abookmarks/ckeen.list~: No such file or directory

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What's the one-argument procedure to check if a list is empty?
Visually impaired? Let me spell it for you (wav file) download WAV