Simplify logic

salt/files/master.d/f_defaults.conf

@@ -73,11 +73,7 @@
 # Note that enabling this feature means that minions will not be
 # available to target for up to the length of the maintanence loop
 # which by default is 60s.
-{%- if cfg_master['key_cache'] in cfg_master %}
 {{ get_config('key_cache', '') }}
-{% else %}
-#key_cache: ''
-{% endif %}
 
 # Directory to store job and cache data:
 # This directory may contain sensitive data and should be protected accordingly.