tilestache-server seems to fail proxying https tile providers

[bongo]

I noticed that starting tilestache-server fails, if it's given an https url as tile provider like so:

tilestache2.cfg (failing):

{
  "cache":  {"name": "Test"},
  "layers":
  {
    "roads":
    {
        "provider": {
          "name": "proxy",
          "url": "https://tile.openstreetmap.org/{Z}/{X}/{Y}.png"
        }
    }
  }
}

/usr/lib/python2.7/dist-packages/mapnik2/__init__.py:27: DeprecationWarning:  mapnik2 module has been deprecated,
        please use 'import mapnik'
  warnings.warn(msg, DeprecationWarning)
Traceback (most recent call last):
  File "./scripts/tilestache-server.py", line 56, in <module>
    app = TileStache.WSGITileServer(config=options.file, autoreload=True)
  File "/usr/lib/python2.7/dist-packages/TileStache/__init__.py", line 375, in __init__
    raise Core.KnownUnknown("Error loading Tilestache config file:\n%s" % str(e))
TileStache.Core.KnownUnknown: Error loading Tilestache config file:
'NoneType' object has no attribute 'group'

but changing the protocol to "http" -> it works:

./scripts/tilestache-server.py -i 0.0.0.0 -p 8080  -c ~/tilestache2.cfg
/usr/lib/python2.7/dist-packages/mapnik2/__init__.py:27: DeprecationWarning:  mapnik2 module has been deprecated,
        please use 'import mapnik'
  warnings.warn(msg, DeprecationWarning)
 * Running on http://0.0.0.0:8080/

Version: latest repo checkout of 19.11.2018 (1ecbb8f)
Python: 2.7.9 (debian 8)

[bongo]

Actually I suspect this to come from modestmaps: https://github.com/stamen/modestmaps-py/search?q=group&unscoped_q=group

[bongo]

Okay, so actually this is due to exactly the following line not featuring https matching in modestmaps-py as of version 1.3.1-1 in debian 8:
match = re.match(r'^(http://\S+?)(,http://\S+)?$', template)

In debian jessie's 1.4.7-1, this seems to be fixed (just looking at the regex)

Quickfix: just install the version from debian 9 on deb 8, it doesn't conflict in dependencies and isn't a complex package either: http://ftp.debian.org/debian/pool/main/m/modestmaps-py/python-modestmaps_1.4.7-1_all.deb