Avoid crash if a module is not available on all arches
Theoretically it is possible, and this is the bare minimum of changes
needed to survive such situation. There may be other pitfalls.
Fixes: https://pagure.io/pungi/issue/1309
JIRA: COMPOSE-4016
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>