Don't fail if config-show does not return servers

When uninstalling a cluster and only hidden servers are left,
config-show can return a result set without ipa_master_server entry.

Fixes: https://pagure.io/freeipa/issue/7892
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Francois Cami <fcami@redhat.com>
Reviewed-By: Thomas Woerner <twoerner@redhat.com>

ipaserver/install/ca.py

@@ -125,7 +125,7 @@ def uninstall_check(options):
 
     # skip the checks if the host is the last master
     ipa_config = api.Command.config_show()['result']
-    ipa_masters = ipa_config['ipa_master_server']
+    ipa_masters = ipa_config.get('ipa_master_server', [])
     if len(ipa_masters) <= 1:
         return
 

ipaserver/plugins/pkinit.py

@@ -91,7 +91,7 @@ class pkinit_status(Search):
         if server is not None:
             servers = [server]
         else:
-            servers = ipa_master_config['ipa_master_server']
+            servers = ipa_master_config.get('ipa_master_server', [])
 
         pkinit_servers = ipa_master_config.get('pkinit_server_server')
         if pkinit_servers is None:

ipaserver/plugins/server.py

@@ -482,7 +482,7 @@ class server_del(LDAPDelete):
 
         ipa_config = self.api.Command.config_show()['result']
 
-        ipa_masters = ipa_config['ipa_master_server']
+        ipa_masters = ipa_config.get('ipa_master_server', [])
 
         # skip these checks if the last master is being removed
         if len(ipa_masters) <= 1: