Fix makecache error when no enabled repos (RhBug:1622090)

https://bugzilla.redhat.com/show_bug.cgi?id=1622090
Fixes issue with dnf-makecache.service failing.

Closes: rpm-software-management#1183
Approved by: j-mracek

Author: pkratoch

dnf/base.py

@@ -388,6 +388,10 @@ def update_cache(self, timer=False):
             for repo in self.repos.values():
                 repo._repo.setMaxMirrorTries(1)
 
+        if not self.repos._any_enabled():
+            logger.info(_('There are no enabled repos.'))
+            return False
+
         for r in self.repos.iter_enabled():
             (is_cache, expires_in) = r._metadata_expire_in()
             if expires_in is None:

dnf/cli/commands/makecache.py

@@ -43,12 +43,6 @@ def set_argparser(parser):
         parser.add_argument('timer', nargs='?', choices=['timer'],
                             metavar='timer', help=argparse.SUPPRESS)
 
-    def configure(self):
-        """Verify that conditions are met so that this command can
-        run; namely that there is an enabled repository.
-        """
-        commands._checkEnabledRepo(self.base)
-
     def run(self):
         timer = self.opts.timer is not None or self.opts.timer_opt
         msg = _("Making cache files for all metadata files.")