Avoid Divide by 0 in compute Deviation Ratio

[brandoniles]

In the case where perp's tvl is zero, for example if all notes are redeemed, the divide by zero would revert other user functions.

[openzeppelin-code]

Avoid Divide by 0 in compute Deviation Ratio

Generated at commit: 6bd5755f51d2b316086d6111fa2f3e141c1bd157

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	1 0 0 3 24 28
Dependencies	Critical High Medium Low Note Total	0 0 0 0 0 0

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