File fix-setting-auth-header-on-build.patch of Package python-docker-py.7213

Index: docker-py-1.7.2/docker/api/build.py
===================================================================
--- docker-py-1.7.2.orig/docker/api/build.py
+++ docker-py-1.7.2/docker/api/build.py
@@ -18,7 +18,8 @@ class BuildApiMixin(object):
               custom_context=False, encoding=None, pull=False,
               forcerm=False, dockerfile=None, container_limits=None,
               decode=False, buildargs=None):
-        remote = context = headers = None
+        remote = context = None
+        headers = {}
         container_limits = container_limits or {}
         if path is None and fileobj is None:
             raise TypeError("Either path or fileobj needs to be provided.")