50963accec
This was a pattern inheritted from pkg/errors.Wrapf, which ignored nil errors for convenience. However, it is error-prone, as it is not obvious when returning a nil-error. All call-sites using `wrapAsPluginError` already do a check for nil errors, so remove this code to prevent hard to find bugs. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>