Foreach on "possible" array variables

[FWAJL]

I see a lot of this:

***if(!empty($task_field_analytes)){***
    foreach($task_field_analytes as $analyte){
        //Do stuff
    }   
}

I think it is safer to check if empty _and_ is_array so that you know it is an array. It will avoid having the case where we have a SQL error and the UI breaks. We will log the error in the BaseManager.