Handle equal-return edge case in CLA max_sharpe#744

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Handle equal-return edge case in CLA max_sharpe #744
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Whning0513:fix-cla-equal-returns-738

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treat None lambdas consistently in CLA case-b comparisons
let max_sharpe() fall back to the same solution as min_volatility() when expected returns are equal
add a regression test covering equal expected returns

Closes #738


 Handle equal-return edge case in CLA max_sharpe

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