Fix repo_url definition
diff --git a/linux/system/repo.sls b/linux/system/repo.sls
index 08b4abc..04e7070 100644
--- a/linux/system/repo.sls
+++ b/linux/system/repo.sls
@@ -29,7 +29,7 @@
 
 {%- do default_repos.update({name: repo}) %}
 
-{%- if repo.key_url %}
+{%- if repo.key_url|default(False) %}
 
 linux_repo_{{ name }}_key:
   cmd.wait: