1.0.0+kodimov.8: guide refresh doesn't fail at random; retry after 30 min

datetime.strptime sometimes fails in Kodi's embedded Python ('NoneType'
object is not callable), which aborted the whole guide export. Build the
XMLTV times without it.

The service now checks every 30 minutes and refreshes when the files are
over 6 hours old, so a failed refresh is retried soon. write_if_changed
touches an unchanged file so its time means "last refreshed".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

addon.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <addon id="plugin.video.kodimovplus"
        name="KodiMov+"
-       version="1.0.0+kodimov.7"
+       version="1.0.0+kodimov.8"
        provider-name="Paco8, xocko">
   <requires>
   <!--- <import addon="xbmc.python" version="2.25.0"/> -->
@@ -21,7 +21,8 @@
     <summary lang="es_ES">Movistar+ para Kodi, con inicio de sesión automático desde la red de Movistar</summary>
     <description lang="en_GB">Fork of Paco8's Movistar+ add-on (plugin.video.movistarplus). Logs in by itself from the Movistar home network, keeps the channel list and numbers up to date, hides the channels that need stronger DRM than Kodi has, adds free Galician channels (TVG2, TeleVigo) and writes a programme guide for every channel. Requires a Movistar+ subscription.</description>
     <description lang="es_ES">Fork del addon Movistar+ de Paco8 (plugin.video.movistarplus). Inicia sesión solo desde la red de Movistar, mantiene la lista y los números de los canales al día, oculta los canales que necesitan una protección que Kodi no tiene añade canales gallegos gratuitos (TVG2, TeleVigo) y genera la guía de programación de todos los canales. Se necesita estar abonado a Movistar+.</description>
-    <news>1.0.0+kodimov.7: the programme guide has the synopsis, picture, genre, year and age rating of each programme. IPTV Simple now reloads the guide every hour instead of once a day, so a new guide shows up in Kodi by itself (existing TV guide setups are switched over once).
+    <news>1.0.0+kodimov.8: the programme guide refresh no longer fails at random inside Kodi, and a failed refresh is tried again half an hour later instead of 6 hours later.
+1.0.0+kodimov.7: the programme guide has the synopsis, picture, genre, year and age rating of each programme. IPTV Simple now reloads the guide every hour instead of once a day, so a new guide shows up in Kodi by itself (existing TV guide setups are switched over once).
 1.0.0+kodimov.6: the programme guide refreshes on its own again on boxes first set up with kodimov.1, where the automatic guide export had stayed off (the guide ran out after 2 days).
 1.0.0+kodimov.5: TV guide setup writes the programme guide before creating the IPTV Simple settings, so the guide isn't empty on a new box.
 1.0.0+kodimov.4: first login on a new box needs no password from the Movistar home network: the account is found and the box registered automatically.