Could not find columns declared on the competition leaderboard

The following error can happen when uploading a v1.5 bundle:

Could not find columns declared on the competition leaderboard

It can be solved by adding the rank in the competition.yaml when defining the leaderboard's columns. An example of this fix can be found in this commit: https://github.com/codalab/competition-examples/commit/9a7f25f86acdbfae91756dad8011ae164dbc7fd8

Usually it is not a problem because most v1 bundles have these ranks defined. However, we could have a default value or something to make sure all v1 bundles are working fine.

See the following part of the code: https://github.com/codalab/codabench/blob/46f68ee91511a79d10fab817ca1164e35cd32d58/src/apps/competitions/unpackers/v1.py#L144