emoticomix & erzaehlmirnix sometimes indicate a new comic, while there is none

[Olf0]

Issue description

DailyComics sometimes indicates a new comic strip for emoticomix or erzaehlmirnix, but there is no new one (i.e., the last / recent one is displayed).

Issue analysis

This happens, because Facebook (from where the strips are being pulled) alters the image download link once or twice a day.
This seems to make DailyComics believe that there is a new comic strip to display.

Issue resolution

AFAICS, not much can be done about this, because Facebook deliberately prevents their auto-generated web pages to provide a permanent link to any image; actually most images shown in a Browser at Facebook need JavaScript to construct their URLs correctly.