AIME Calculations fails on sub-35 earnings records

The getAIMEFromEarnings calculation expects that the user provides an earnings record with, at minimum, 35 years. If the user has <35 records, the output will be NaN on the final value page.

Currently setting up a testing framework so we can refactor the code for this.

Locate the getAIMEFromEarnings calculation and the final value page where its result is displayed. First reproduce the NaN result with an earnings record containing fewer than 35 years, then use the testing framework currently being set up to cover that case. Done means sub-35 records produce a valid final value rather than NaN.

Written by the indexing model from the issue text.