Issue Summary

del queue_monitor_length.notifying fails when queue_monitor_length_notify: false and notifying is not set in the inventory. This was introduced by #5127

Which components of AVD are impacted

eos_designs

AVD version

5.3.0 and later

Ansible version

No response

Python version

No response

How do you run AVD ?

None

Steps to reproduce

Relevant log output

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