fix: ensure the vanity is known before deleting it

Author: tdstein

src/posit/connect/vanities.py

@@ -184,6 +184,7 @@ def vanity(self) -> None:
         --------
         reset_vanity
         """
+        self.vanity
         if self._vanity:
             self._vanity.destroy()
         self.reset_vanity()

tests/posit/connect/test_vanities.py

@@ -109,7 +109,7 @@ def test_vanity_deleter(self):
         url = Url(base_url)
         params = ResourceParameters(session, url)
         content = VanityMixin(params, guid=guid)
-        content._vanity = Vanity(params, content_guid=guid)
+        content._vanity = Vanity(params, path=Mock(), content_guid=guid, created_time=Mock())
         del content.vanity
 
         assert content._vanity is None