fallback to orig err msg if no err causes found
fallback to orig err msg if no err causes found

Receiving an error from the server, when processing a template, that
contained no error causes would cause the `oc process` command to return
a non-helpful error message:

"error: unable to process template"

This patch falls back to returning the original error message in the
event that no specific error causes are able to be extracted from the
received error message.

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