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