EC2Query empty list serialization behavior is incorrect

[lucix-aws]

A previous change to the query protocols was made to explicitly serialize empty lists as list=. While this is correct for regular query it does not seem to apply to ec2query (which is only used by EC2).

Smithy has corrected this in the protocol tests in smithy-lang/smithy#2269.

My inclination right now is to just revert the behavior without opt-in, since we technically handled it this way before and it only affects the EC2 service.

Related

• Bad request when describe key pairs with empty filters slice #2624
• RevokeSecurityGroupEgress and AuthorizeSecurityGroupEgress requests not working #2559

[github-actions]

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