"key is not a nested object" when part of path is null

[retrodaredevil]

This error message is not always helpful when part of the data path is null.

We should check for null and provide a more descriptive message.

wild-graphql-datasource/pkg/plugin/parsing/parsing.go

Line 41 in ca229d7

return nil, errors.New(fmt.Sprintf("Part of data path: %s is not a nested object! dataPath: %s", part, dataPath))