python3-apport regression: missing argument in Report.add_proc_environ call

This is a regression in the 2.20.9-0ubuntu7.8 security update of apport

# lsb_release -rd
Description: Ubuntu 18.04.3 LTS
Release: 18.04

Reproduce the bug:

$ python3
Python 3.6.8 (default, Oct 7 2019, 12:59:55)
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import apport
>>> import os
>>> report = apport.Report()
>>> report.add_proc_info(os.getpid(), extraenv=['PYTHONHOME', 'PYTHONPATH'])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/apport/report.py", line 543, in add_proc_info
    self.add_proc_environ(pid, extraenv)
  File "/usr/lib/python3/dist-packages/apport/report.py", line 610, in add_proc_environ
    env = _read_file('environ', dir_fd=proc_pid_fd).replace('\n', '\\n')
  File "/usr/lib/python3/dist-packages/apport/report.py", line 73, in _read_file
    with open(path, 'rb', opener=lambda path, mode: os.open(path, mode, dir_fd=dir_fd)) as fd:
  File "/usr/lib/python3/dist-packages/apport/report.py", line 73, in <lambda>
    with open(path, 'rb', opener=lambda path, mode: os.open(path, mode, dir_fd=dir_fd)) as fd:
TypeError: argument should be integer or None, not list

Patch below:

# diff -u /usr/lib/python3/dist-packages/apport/report.py /usr/lib/python3/dist-packages/apport/report.py.new
--- /usr/lib/python3/dist-packages/apport/report.py 2019-11-01 14:16:39.375968798 +0100
+++ /usr/lib/python3/dist-packages/apport/report.py.new 2019-11-01 14:17:58.035128006 +0100
@@ -540,7 +540,7 @@
             self['ProcCwd'] = os.readlink('cwd', dir_fd=proc_pid_fd)
         except OSError:
             pass
- self.add_proc_environ(pid, extraenv)
+ self.add_proc_environ(pid, proc_pid_fd, extraenv)
         self['ProcStatus'] = _read_file('status', dir_fd=proc_pid_fd)
         self['ProcCmdline'] = _read_file('cmdline', dir_fd=proc_pid_fd).rstrip('\0')
         self['ProcMaps'] = _read_maps(proc_pid_fd)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: python3-apport 2.20.9-0ubuntu7.8
ProcVersionSignature: Ubuntu 4.15.0-58.64-generic 4.15.18
Uname: Linux 4.15.0-58-generic x86_64
ApportLog:

ApportVersion: 2.20.9-0ubuntu7.8
Architecture: amd64
CrashReports: 640:1000:1004:35152:2019-11-01 14:00:47.150214442 +0100:2019-11-01 14:00:47.150214442 +0100:/var/crash/_usr_bin_snimpy.1000.crash
Date: Fri Nov 1 14:18:16 2019
PackageArchitecture: all
SourcePackage: apport
UpgradeStatus: No upgrade log present (probably fresh install)