fix: when trades for zero are requested don't throw #4522
Merged
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closes: #4114
Description
I thought no one needed to request zero prices, and so I threw in that
case. #4114 reveals a
situation where it will happen in ordinary circumstances.
Change the AMM code to respond with an empty amount when an empty
amount is offered, and vice versa.
Security Considerations
None
Documentation Considerations
None
Testing Considerations
Updated tests.