DNS Locations: dnsserver: print specific error when DNS is not installed

Print 'DNS is not configured' if there is no IPA DNS in domain

https://fedorahosted.org/freeipa/ticket/2008

Reviewed-By: Petr Spacek <pspacek@redhat.com>

ipaserver/plugins/dnsserver.py

@@ -11,6 +11,7 @@ from ipalib import (
     DNSNameParam,
     Str,
     StrEnum,
+    errors,
 )
 from ipalib.frontend import Local
 from ipalib.plugable import Registry
@@ -27,6 +28,7 @@ from ipaserver.plugins.baseldap import (
     LDAPCreate,
     LDAPDelete,
 )
+from .dns import dns_container_exists
 
 
 __doc__ = _("""
@@ -138,6 +140,11 @@ class dnsserver(LDAPObject):
         ),
     )
 
+    def get_dn(self, *keys, **options):
+        if not dns_container_exists(self.api.Backend.ldap2):
+            raise errors.NotFound(reason=_('DNS is not configured'))
+        return super(dnsserver, self).get_dn(*keys, **options)
+
 
 @register()
 class dnsserver_mod(LDAPUpdate):