Binder Links Inconsistent Between Gallery Repo and Individual Notebooks

[salvis2]

On the gallery website, you can go into any of the sets of examples backed by a repo and open up the repo in the binderhub that was specified in binder-gallery.yaml. This launches into the binderhub and appears all fine and dandy. I was checking links for pangeo-tutorial-gallery. The binder link for pangeo-tutorial-gallery is:

https://aws-uswest2-binder.pangeo.io/v2/gh/pangeo-data/pangeo-tutorial-gallery/binder-env?urlpath=git-pull?repo=https://github.com/pangeo-data/pangeo-tutorial-gallery%26amp%3Burlpath=lab/tree/pangeo-tutorial-gallery

If you click into one of the notebooks (for my example, say, Geopandas) within the gallery website, there is a binder link in the sidebar. However, it does not work properly. The link in this case is

https://aws-uswest2-binder.pangeo.io/v2/gh/pangeo-data/pangeo-tutorial-gallery/master/?urlpath=git-pull?repo=https://github.com/pangeo-data/pangeo-tutorial-gallery%26amp%3Burlpath=lab/tree/pangeo-tutorial-gallery/geopandas.ipynb%3Fautodecode

I made a different branch for the environment, so I wasn't sure if that was part of the problem. I can see that the notebook link starts from master instead of binder-env, where I put the environment information.

Trying the individual links for the Enhanced Intake-ESM Catalog Demo within the CESM LENS gallery and the individual link @TomAugspurger 's Pangeo and Dask Gateway gallery notebook both worked fine. The LENS gallery references it's own image setup in the same repo and branch as the notebooks and the Pangeo / Dask gallery references the pangeo-gallery default-binder.

So clearly I have been silly with making a new branch, but it this something that we should build support for, or do we want to specifically note that your binder/ folder, if you are specifying it, should also be in master?