Fix key error
Fix key error

Attempt to fix #173. Latest version of the code preferentially runs a single test at a time rather than a set of tests. Change makes the code check whether the result of the required test is in memory.
castelao/AutoQC,BillMills/AutoQC,IQuOD/AutoQC,s-good/AutoQC,IQuOD/AutoQC,BillMills/AutoQC,s-good/AutoQC