Improve Jinja2 templates for super-spines to avoid error in case of unusual config

[ankudinov]

Issue Type

• Bug Report

Summary

Currently eos_l3ls_evpn is reporting error when documentation is generated for super-spines with L2 links.
While L2 links are not required on super-spines, Jinja2 template filters must be improved to verify if data is valid.

Role or Module Name

eos_l3ls_evpn
for example: https://github.com/aristanetworks/ansible-avd/blob/devel/ansible_collections/arista/avd/roles/eos_l3ls_evpn/templates/documentation/dc-p2p-links.j2

Expected results

Ignore invalid data to avoid the error or (preferred) report inconsistencies.