Tests for my package are suddenly failing with new gdal (possibly rasterio), but the error is showing up with a pyproj error. You can see it in one of our travis jobs:

https://travis-ci.org/pytroll/satpy/jobs/484681655#L6502-L6521

The tests that are failing are not part of the things that were changed in the commit being tested. From what I can tell (as someone familiar with the code) is that we are loading a geotiff from disk using xarray.open_rasterio, accessing the data_arr.attrs['crs'], and parsing that PROJ.4 string later on and passing it to pyproj.Proj. I'm wondering if xarray/rasterio/gdal is returning an empty CRS string.

Something that is curious is that it doesn't seem to fail on OSX Python 3.6, but does fail on Linux py36 and OSX/Linux py27.