Fix for coded concept broken with Most Recent Observation on dashboard TRUNK-4131

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This is not guaranteed to be the newly created obs, there could have been an existing once, the proper way is to add a check if the list returned by getObservationsByPersonAndConcept was empty before if not then store the list before and after creating a new one check that it has been incremented and that there is a new observation in the new list returned by getObservationsByPersonAndConcept.