RSS channel without pub_date doesn't work

[Riduidel]

As an example, XKCD (https://xkcd.com/rss.xml) has no pub_date set at the feed level. Feed should be parsed correctly

[Riduidel]

As an aside, it seems date parsing in item doesn't work that well ...

INFO [rrss2imap::feed] There should be new entries, parsing HTML content
thread 'main' panicked at 'pub_date for item Item { title: Some("Physics Suppression"), link: Some("https://xkcd.com/2113/"), description: Some("<img src=\"https://imgs.xkcd.com/comics/physics_suppression.png\" title=\"If physics had a mafia, I\'m pretty sure the BICEP2 mess would have ended in bloodshed.\" alt=\"If physics had a mafia, I\'m pretty sure the BICEP2 mess would have ended in bloodshed.\" />"), author: None, categories: [], comments: None, enclosure: None, guid: Some(Guid { value: "https://xkcd.com/2113/", permalink: true }), pub_date: Some("Mon, 18 Feb 2019 05:00:00 -0000"), source: None, content: None, extensions: {}, itunes_ext: None, dublin_core_ext: None } (value is Some("Mon, 18 Feb 2019 05:00:00 -0000")) can't be parsed. ParseError(NotEnough)', src\item.rs:16:32
stack backtrace:

[Riduidel]

Bug come directly from chrono. Unfortunatly, it is a one-year-old bug already !