shithub: hugo

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Add proper error message when receiving nil in Resource transformation

Closes #6128

--- a/resources/transform.go

+++ b/resources/transform.go

@@ -19,6 +19,8 @@

 	"strconv"

 	"strings"

+	"github.com/pkg/errors"

+

 	"github.com/gohugoio/hugo/common/collections"

 	"github.com/gohugoio/hugo/common/herrors"

 	"github.com/gohugoio/hugo/common/hugio"

@@ -43,6 +45,10 @@

 )

 func (s *Spec) Transform(r resource.Resource, t ResourceTransformation) (resource.Resource, error) {

+	if r == nil {

+		return nil, errors.New("got nil Resource in transformation. Make sure you check with 'with' or 'if' when you get a resource, e.g. with resources.Get.")

+	}

+

 	return &transformedResource{

 		Resource:                    r,

 		transformation:              t,