conda build invalid/path should fail with nonzero exit status

[kernc]

conda-build exits with return status 0 and with no error printed if ran as, for example:

$ conda build what-the-fuck-is-this-shit
$ 

This is very misleading. The user expected something conda-build obviously couldn't deliver, so it should issue an error and set exit status != 0.

[msarahan]

Thanks for reporting. I know I've fixed this, but afraid I did so on a long running branch. Will find and port ASAP.

[kernc]

A broader issue spanning subcommands: conda/conda#4512

[msarahan]

Fixed in #1585

[github-actions]

Hi there, thank you for your contribution!

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