Fixed the logic of the warning in list

The warning about not all items have been shown in the list call was
exactly the wrong way around.
It we actually hit StopIteration, we _have_ seen them all.

fixes #1068

CHANGES/pulp-glue/1068.bugfix

@@ -0,0 +1 @@
+Fixed the "list" commands to show the notification about not displaying all items when it shouldn't and the other way around.

pulp-glue/pulp_glue/common/context.py

@@ -845,6 +845,8 @@ def list(self, limit: int, offset: int, parameters: t.Dict[str, t.Any]) -> t.Lis
                     self.list_iterator(parameters=parameters, offset=offset, stats=stats)
                 )
         except StopIteration:
+            pass
+        else:
             self.pulp_ctx.echo(
                 _("Not all {count} entries were shown.").format(count=stats["count"]), err=True
             )