Read errors when unmarshalling command output in CancelTask CAT
Read errors when unmarshalling command output in CancelTask CAT

- Allows us to catch errors where JSON is not unmarshalled as expected (eg due to typos in unmarshal key mappings)

[#111473134]

Signed-off-by: Jen Spinney <475b118f8db4f150e7ed3b69b35fd7c857f9c9f8@hpe.com>

matt-royal/cf-acceptance-tests,matt-royal/cf-acceptance-tests,matt-royal/cf-acceptance-tests,matt-royal/cf-acceptance-tests,matt-royal/cf-acceptance-tests,matt-royal/cf-acceptance-tests,matt-royal/cf-acceptance-tests,matt-royal/cf-acceptance-tests