model: avoid setting value on getter

* closes zenodo/rdm-project#521

invenio_accounts/models.py

@@ -216,12 +216,6 @@ def email(self, email):
     @hybrid_property
     def user_profile(self):
         """Get the user profile."""
-        # NOTE: accessing this property requires an initialized app for config
-        if self._user_profile is None:
-            return None
-        elif not isinstance(self._user_profile, UserProfileDict):
-            return UserProfileDict(**self._user_profile)
-
         return self._user_profile
 
     @user_profile.setter
@@ -235,12 +229,6 @@ def user_profile(self, value):
     @hybrid_property
     def preferences(self):
         """Get the user preferences."""
-        # NOTE: accessing this property requires an initialized app for config
-        if self._preferences is None:
-            return None
-        elif not isinstance(self._preferences, UserPreferenceDict):
-            self._preferences = UserPreferenceDict(**self._preferences)
-
         return self._preferences
 
     @preferences.setter