chore(version-info): previousVersions should not return undefined

Closes #6702

Author: petebacondarwin

lib/versions/version-info.js

@@ -124,6 +124,8 @@ var getPreviousVersions =  function() {
       })
       .sort(semver.compare)
       .value();
+  } else {
+    return [];
   }
 };