Correct CRF calcualtions for empty discount rates #234
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Description
In this PR I have addressed the failing CRF calculation if no discount rate is provided (which was partially addressed in PR #216). Following @willu47's suggestion in ticket #217, the
_expand_default()function is used to ensure discount rate data is always passed into the CRF, PVA, and Discount Factor functions. Since handling theDiscountRateandDiscountRateIdvdifferences is a little confusing (imo), I also added inValueErrorchecks to the functions to check for non-empty discount rates - but these shouldnt really be needed. Just added as double check.Issue Ticket Number
closes #217
Documentation
na