[Bug]: Skills array in agent card cannot be empty?

[Blackhex]

What happened?

I didn't find any mention in the specification that would justify

a2a-tck/tests/mandatory/protocol/test_agent_card_mandatory.py

Line 122 in 73d170d

assert isinstance(skills, list), "skills must be an array"

check requiring that agent card skills array should not be empty list.

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