Copy an experiment to run in a different platform

I was trying to copy an existing experiment because I want to run the same configuration but in a different platform. This platform (nimbus) was not defined in the platforms.conf of the original experiment and I got this error when I ran the copy command (using version 3.13):

 [CRITICAL] On Configuration files:
Critical Issues on [Expdef] config file:
[Default] Main platform is not defined! check if [HPCARCH = nimbus5] has any typo
 [eCode=7014]

Maybe it would be better to just show a warning and let the copy finish, as I suppose that if the platform is not defined it will fail when the run is done.

@dbeltran do you think this could be fixed?