Ticket #48048 - Fix coverity issues - 2015/2/24
    
    Coverity defect 11895 - Explicit null dereferenced (FORWARD_NULL)
    Coverity defect 13037 - Explicit null dereferenced (FORWARD_NULL)
    Coverity defect 13039 - Dereference after null check (FORWARD_NULL)
    Coverity defect 13043 - Explicit null dereferenced (FORWARD_NULL)
    Coverity defect 13044 - Explicit null dereferenced (FORWARD_NULL)
    Description:  Added NULL check for op, e, and op_params.
    modified: copy_operation_parameters, write_changelog_and_ruv,
    and cancel_opcsn in repl5_plugins.c