Improve experience when an optional parameter is not defined on results, groups, and testcases
    
    * Use resultsdb_api that supports v2 in Docker
    * Only show a result's ref_url when it is defined
    * Display a result's note only when it is defined when in the details view
    * Only show the result's groups if it is associated with at least one group
    * Only show a groups's ref_url when it is defined
    * Only display a link to a group's associated results when it is associated with at least one result
    * Only show a testcase's ref_url when it is defined
    * Remove inconsistencies of either showing a dash or a blank space in a column for a result's property that is not defined
    
    Differential Revision: https://phab.qa.fedoraproject.org/D1120