fix [clojars] snapshot fallback (#3187)

* fix snapshot fallback

* fix prettier formatting

* update schema

* chore: test schema tweak

* fix schema

* Add allow null on schema

services/clojars/clojars-base.js

@@ -7,8 +7,8 @@ const { BaseJsonService } = require('..')
 
 const clojarsSchema = Joi.object({
   downloads: nonNegativeInteger,
+  latest_release: Joi.string().allow(null),
   latest_version: Joi.string().required(),
-  latest_release: Joi.string().required(),
 }).required()
 
 class BaseClojarsService extends BaseJsonService {

services/clojars/clojars-release.service.js

@@ -5,7 +5,10 @@ const { BaseClojarsVersionService } = require('./clojars-base')
 module.exports = class ClojarsVersionRelease extends BaseClojarsVersionService {
   async handle({ clojar }) {
     const json = await this.fetch({ clojar })
-    return this.constructor.render({ clojar, version: json.latest_release })
+    return this.constructor.render({
+      clojar,
+      version: json.latest_release ? json.latest_release : json.latest_version,
+    })
   }
 
   static get route() {