seeing the same on the armel images which come without email client (we ship the desktop-webmail package instead which only installs a mime type but no mailer icons) and with rhythmbox (due to mono issues on arm) by default.
either the icons need to get default fallbacks (i.e. if a mime type and app assignment through this exists but no icon is available) or simply be hidden if the relevant app is not available.
seeing the same on the armel images which come without email client (we ship the desktop-webmail package instead which only installs a mime type but no mailer icons) and with rhythmbox (due to mono issues on arm) by default.
either the icons need to get default fallbacks (i.e. if a mime type and app assignment through this exists but no icon is available) or simply be hidden if the relevant app is not available.