Fixed version suggestion logic.

Previously, if it had search everything and found nothing, that means it also cannot find `maxVersion`.
Thus, this commit's solution is to simply find anything that is not yet yanked even if it is unstable.
If even this fails, then we truly have nothing to offer thereby offering an empty page.

Author: hbina

app/routes/crate/version.js

@@ -11,7 +11,7 @@ export default Route.extend({
 
   flashMessages: service(),
 
-  refreshAfterLogin: observer('session.isLoggedIn', function() {
+  refreshAfterLogin: observer('session.isLoggedIn', function () {
     this.refresh();
   }),
 
@@ -43,14 +43,28 @@ export default Route.extend({
           .get('versions')
           .then(versions => {
             const latestStableVersion = versions.find(version => {
+              // Find the latest version that is stable AND not-yanked.
               if (!isUnstableVersion(version.get('num')) && !version.get('yanked')) {
                 return version;
               }
             });
 
             if (latestStableVersion == null) {
-              // If no stable version exists, fallback to `maxVersion`
-              params.version_num = maxVersion;
+              // Cannot find any version that is stable AND not-yanked.
+              // The fact that "maxVersion" itself cannot be found means that
+              // we have to fall back to the latest one that is unstable....
+              const latestUnyankedVersion = versions.find(version => {
+                // Find the latest version that is stable AND not-yanked.
+                if (!version.get('yanked')) {
+                  return version;
+                }
+              });
+              if (latestStableVersion == null) {
+                // There's not even any unyanked version...
+                params.version_num = maxVersion;
+              } else {
+                params.version_num = latestUnyankedVersion;
+              }
             } else {
               params.version_num = latestStableVersion.get('num');
             }