Comment 1 for bug 1801168

This fix was landed to master last year.

commit dbd94e58c56f871ae56c7ffd13be40b392808068
Author: Scott Moser <email address hidden>
Date: Thu Nov 1 17:10:44 2018 -0400

    build: Fix build when there are no quilt patches.

    If a package did not have any quilt packages, then git-ubuntu build
    would stack trace trying to copy the non-existant .pc directory.

    As an example:
      $ git ubuntu clone requests
      $ git checkout pkg/import/2.18.4-2
      $ git ubuntu build

    LP: #1801168