Remove the NoNaturalKey error

It's too awkward, and it makes more sense to return None instead.

awxkit/awxkit/api/pages/page.py

@@ -319,14 +319,16 @@ class Page(object):
 
     def get_natural_key(self):
         if not getattr(self, 'NATURAL_KEY', None):
-            raise exc.NoNaturalKey(
-                "Page does not have a natural key: {}".format(getattr(self, 'endpoint', repr(self.__class__)))
-            )
+            return None
+
         natural_key = {}
         for key in self.NATURAL_KEY:
             if key in self.related:
-                # FIXME: use caching by url
-                natural_key[key] = self.related[key].get().get_natural_key()
+                try:
+                    # FIXME: use caching by url
+                    natural_key[key] = self.related[key].get().get_natural_key()
+                except exc.Forbidden:
+                    return None
             elif key in self:
                 natural_key[key] = self[key]
         if not natural_key:
@@ -395,7 +397,7 @@ class PageList(object):
         return self.__item_class__(self.connection).create(*a, **kw)
 
     def get_natural_key(self):
-        raise exc.NoNaturalKey
+        return None
 
 
 class TentativePage(str):

awxkit/awxkit/api/pages/roles.py

@@ -1,4 +1,6 @@
 from awxkit.api.resources import resources
+import awxkit.exceptions as exc
+
 from . import base
 from . import page
 
@@ -14,8 +16,11 @@ class Role(base.Base):
             if name not in ('users', 'teams')
         ]
         if related_objs:
-            # FIXME: use caching by url
-            natural_key['content_object'] = related_objs[0].get().get_natural_key()
+            try:
+                # FIXME: use caching by url
+                natural_key['content_object'] = related_objs[0].get().get_natural_key()
+            except exc.Forbidden:
+                return None
 
         return natural_key
 

awxkit/awxkit/exceptions.py

@@ -106,8 +106,3 @@ class IsMigrating(Common):
 class ImportExportError(Exception):
 
     pass
-
-
-class NoNaturalKey(ImportExportError):
-
-    pass