Move typeof guard into test run callbacks and log a helpful message if `failureCount` is not a number.
Move typeof guard into test run callbacks and log a helpful message if `failureCount` is not a number.

DispatchMe/meteor-mocha,DispatchMe/meteor-mocha,meteortesting/meteor-mocha,DispatchMe/meteor-mocha,meteortesting/meteor-mocha,meteortesting/meteor-mocha