Description: rdiff-backup is failing after the latest OS updates


Additional info:
* rdiff-backup 2.0.0

Steps to reproduce:
* run rdiff-backup to backup a directory
* error occurs:

Traceback (most recent call last):
File "/usr/bin/rdiff-backup", line 32, in <module>
rdiff_backup.Main.error_check_Main(sys.argv[1:])
File "/usr/lib/python3.8/site-packages/rdiff_backup/Main.py", line 390, in error_check_Main
Main(arglist)
File "/usr/lib/python3.8/site-packages/rdiff_backup/Main.py", line 412, in Main
take_action(rps)
File "/usr/lib/python3.8/site-packages/rdiff_backup/Main.py", line 348, in take_action
Backup(rps[0], rps[1])
File "/usr/lib/python3.8/site-packages/rdiff_backup/Main.py", line 434, in Backup
backup.Mirror_and_increment(rpin, rpout, incdir)
File "/usr/lib/python3.8/site-packages/rdiff_backup/backup.py", line 55, in Mirror_and_increment
DestS.patch_and_increment(dest_rpath, source_diffiter, inc_rpath)
File "/usr/lib/python3.8/site-packages/rdiff_backup/backup.py", line 279, in patch_and_increment
for diff in rorpiter.FillInIter(source_diffiter, dest_rpath):
File "/usr/lib/python3.8/site-packages/rdiff_backup/rorpiter.py", line 202, in FillInIter
for rp in rpiter:
File "/usr/lib/python3.8/site-packages/rdiff_backup/backup.py", line 114, in get_diffs
for dest_sig in dest_sigiter:
File "/usr/lib/python3.8/site-packages/rdiff_backup/backup.py", line 196, in get_sigs
for src_rorp, dest_rorp in cls.CCPP:
File "/usr/lib/python3.8/site-packages/rdiff_backup/backup.py", line 361, in __next__
source_rorp, dest_rorp = next(self.iter)
File "/usr/lib/python3.8/site-packages/rdiff_backup/rorpiter.py", line 95, in Collate2Iters
relem1 = next(riter1)
File "/usr/lib/python3.8/site-packages/rdiff_backup/rorpiter.py", line 376, in __next__
next_elem = next(self.iter)
File "/usr/lib/python3.8/site-packages/rdiff_backup/selection.py", line 138, in Iterate_fast
rpath, val = next(diryield_stack[-1])
File "/usr/lib/python3.8/site-packages/rdiff_backup/selection.py", line 121, in diryield
new_rpath = robust.check_common_error(
File "/usr/lib/python3.8/site-packages/rdiff_backup/robust.py", line 44, in check_common_error
return error_handler(exc, *args)
File "/usr/lib/python3.8/site-packages/rdiff_backup/selection.py", line 108, in error_handler
log.ErrorLog.write_if_open("ListError", rpath.index + (filename, ),
File "/usr/lib/python3.8/site-packages/rdiff_backup/log.py", line 313, in write_if_open
cls.write(error_type, rp, exc)
File "/usr/lib/python3.8/site-packages/rdiff_backup/log.py", line 284, in write
logstr = cls.get_log_string(error_type, rp, exc)
File "/usr/lib/python3.8/site-packages/rdiff_backup/log.py", line 322, in get_log_string
return "%s: '%s' %s" % (error_type, cls.get_indexpath(rp), exc)
File "/usr/lib/python3.8/site-packages/rdiff_backup/log.py", line 302, in get_indexpath
return "/".join(obj)
TypeError: sequence item 0: expected str instance, bytes found