fix(framework): Test app for object not found error

[danieljanes]

DO NOT MERGE

Steps to reproduce

Start federation:

• Start SuperLink: flower-superlink --insecure
• Start SuperNode 1: flower-supernode --insecure --clientappio-api-address 0.0.0.0:9094
• Start SuperNode 2: flower-supernode --insecure --clientappio-api-address 0.0.0.0:9095

Run app:

• cd examples/objecttest
• flwr run