Fixed duplicated episodes on sites such as Patreon which emit changing URLs. Now uses the <guid> element as an id if it's present in the feed in preference to the URL.
Correctly retrieve episode descriptions where an empty <itunes:description/> element and a <description> element may both exist in the feed.
Fixed bug where the filtered episode lists would end prematurely, and hence unscrollable, if there were less displayable episodes and date separators than the length of the episode list.
<guid>element as an id if it's present in the feed in preference to the URL.<itunes:description/>element and a<description>element may both exist in the feed.