fix: O3-5485 Fix NaN return from computeAverageWaitTimeInMinutes when no entries have endedAt#99

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sanks011:O3-5485-queue-utils-compute-average-wait-time-in-minutes-returns-na-n-when-all-queue-entries-have-null-ended-atsanks011/openmrs-module-queue:O3-5485-queue-utils-compute-average-wait-time-in-minutes-returns-na-n-when-all-queue-entries-have-null-ended-atCopy head branch name to clipboard