Do not store application info in the DB

[Siegfried Gevatter]

""""""""""""""""""""""""""""""""""""""""""
# Insert the application
# FIXME: Is reading the .desktop file and storing that stuff into
# the DB really required?
app_info = DesktopEntry(ritem["app"])
app_uri_id, app_content_id, app_source_id = self._get_ids(ritem["app"],
 unicode(app_info.getType()), unicode(app_info.getExec()).split()[0])
app_item = self._get_item(app_uri_id, app_content_id, app_source_id,
 unicode(app_info.getName()), icon=unicode(app_info.getIcon()))
try:
 self.store.execute("INSERT INTO app (item_id, info) VALUES (?,?)",
  (app_uri_id, unicode(ritem["app"])), noresult=True)
except sqlite3.IntegrityError:
 pass
""""""""""""""""""""""""""""""""""""""""

Why are we inserting this into the DB (and making insertion slower by loading all the .desktop files, which should probably be workarounded with a cache in case we keep it) when we don't use it for anything, and this isn't contemplated in the Database spec?

(Additionally, in case we keep it we need to contemplate that Exec= may be empty, as else this results in a crash).