Ticket #621 - modify operations without values do not get replicated
    
    Description: This was introduced by the fix for ticket 561 where in the
    _cl5WriteMod the mods were checked if the values need to be encrypted
    and only mods with values were written to the changelog
    
    reviewed by Mark, Thanks
    
    (cherry picked from commit 5a5ff2640d6e66c925550498211743a8f78a8477)