fix error handling output for userscripts collector #536
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another fix for error cases:
before: if stderr is returned, but no stdout, we bail out before we report the stderr content - throwing away the error message that may only be reproducible in the conditions of the collector.
after: if stderr is returned, log it regardless of if we bail. log it as warning, not error, since it's non-blocking.
also removed "skipping" from the proc.returncode - we dont actually bail unless there's no stdout, regardless of return code, so dont tell the user we are.