add is_deleted to UserSchema

backend/tracim_backend/models/context_models.py

     def profile(self) -> Profile:
         return self.user.profile.name
 
+    @property
+    def is_deleted(self) -> bool:
+        return self.user.is_deleted
+
     # Context related
 
     @property

backend/tracim_backend/tests/functional/test_user.py

         assert res['email'] == 'test@test.test'
         assert res['public_name'] == 'bob'
         assert res['timezone'] == 'Europe/Paris'
+        assert res['is_deleted'] is False
 
     def test_api__get_user__ok_200__user_itself(self):
         dbsession = get_tm_session(self.session_factory, transaction.manager)
         assert res['email'] == 'test@test.test'
         assert res['public_name'] == 'bob'
         assert res['timezone'] == 'Europe/Paris'
+        assert res['is_deleted'] is False
 
     def test_api__get_user__err_403__other_normal_user(self):
         dbsession = get_tm_session(self.session_factory, transaction.manager)

backend/tracim_backend/views/core_api/schemas.py

         example=True,
         description='Is user account activated ?'
     )
+    is_deleted = marshmallow.fields.Bool(
+        example=False,
+        description='Is user account deleted ?'
+    )
     # TODO - G.M - 17-04-2018 - Restrict timezone values
     timezone = marshmallow.fields.String(
         example="Europe/Paris",