Auto deploying using Bower and NPM WebJar error

[gavioto]

Adding 'Leaflet/Leaflet.label' as webjar bower result in an error.

From webjars website you can deploy new webjars based on bower, but it fails for this plugin.

The result should be similar to this (deploy leaflet sample)

Deployed! It will take a few hours for the Maven Central index to update but you should be able to start using the Bower WebJar now.
GroupID = org.webjars.bower
ArtifactID = leaflet
Version = 0.7.7
Synced With Maven Central
Published BinTray Version
Signed BinTray Assets
Published BinTray Assets
Created BinTray Version
Created BinTray Package
Converted project licenses
Created Bower WebJar
Fetched Bower zip
Generated POM
Converted dependencies to Maven
Got Bower info Determined Artifact Name: leaflet
Starting Deploy

On the other hand, using NPM the error is complaining about License information

Failed! No valid licenses found. No licenses were found. The acceptable licenses on BinTray are at: https://bintray.com/docs/api/#_footnote_1 License detection first uses the package metadata (e.g. package.json or bower.json) and falls back to looking for a LICENSE, LICENSE.txt, or LICENSE.md file in the master branch of the GitHub repo. Since these methods failed to detect a valid license you will need to work with the upstream project to add discoverable license metadata to a release or to the GitHub repo.