Empty values for branches when using list_commits()

[RaananHadar]

Describe the bug
When I used client.list_commits(), the dataframe contains empty values in Branch.

To Reproduce
Steps to reproduce the behavior:

1. I added data and created pipelines with the pachyderm tutorial
2. get some work done on images to populate edges and stats
3. run client.list_commits("edges", n=3)
4. values of "Branch" columns are empty after the head value.
5. this also happens for the "images" repo.

Expected behavior.
Values of should show the proper branch for all commits

Environment:

• OS: ubuntu 18.04
• Python Version: 3.6.8
• Pachyderm Version: 1.9.0

[itssimon]

What you're describing is actually the intended behaviour. See below excerpt from the Pachyderm docs:

A Pachyderm branch is a pointer, or an alias, to a commit that moves along with new commits as they are submitted.

So in other words, a branch is only ever associated with a single commit, which is why the other commits have a blank value in the "Branch" column.