Don't try to read a contributor list from the git log

Debian packages are built from tarballs, so there isn't a git log.

Author: Rebecca N. Palmer <[email protected]>
Forwarded: not-needed


Gbp-Pq: Name contributor_list_not_in_tarball.patch

Author: Debian Science Team

doc/sphinxext/contributors.py

@@ -14,17 +14,16 @@
 While the v0.23.1 tag does not exist, that will use the HEAD of the
 branch as the end of the revision range.
 """
-from announce import build_components
 from docutils import nodes
 from docutils.parsers.rst import Directive
-import git
 
 
 class ContributorsDirective(Directive):
     required_arguments = 1
     name = "contributors"
 
     def run(self):
+        return [nodes.paragraph(), nodes.Text("For contributors, please see /usr/share/doc/contributors_list.txt or https://github.com/pandas-dev/pandas/graphs/contributors")]
         range_ = self.arguments[0]
         if range_.endswith("x..HEAD"):
             return [nodes.paragraph(), nodes.bullet_list()]