bug - when there is a broke reference in swagger, the builder does not throw error

[manorlh]

recover by

add reference that does not exist in the swagger

const basePaths = dereferenced.servers && dereferenced.servers.length
        ? dereferenced.servers.map(({ url }) => new URL(url).pathname)
        : [dereferenced.basePath || '/'];

    Object.keys(dereferenced.paths).forEach(currentPath => {

dereferenced variable content will have the error details, so dereferenced.paths will be undefined.