autojack fails with "local variable 'drates' referenced before assignment"

Following upgrade to 2.2.5, opening studio-controls shows status is undetermined. Jack cannot be started, stop has no effect. Investigation of "systemctl --user status studio" shows autojack has failed.

Attempting to launch autojack shows the following, which looks identical to the output from systemctl:

$ autojack
starting up
install path: /usr
sending quit to any old autojack
old lock file found, killing old pid

Lock file created
logging started
Traceback (most recent call last):
  File "/usr/bin/autojack", line 1713, in <module>
    main()
  File "/usr/bin/autojack", line 1662, in main
    phones_check()
  File "/usr/bin/autojack", line 1498, in phones_check
    import_config("phones_check")
  File "/usr/bin/autojack", line 399, in import_config
    import_device_array()
  File "/usr/bin/autojack", line 240, in import_device_array
    get_dev_info(x)
  File "/usr/bin/autojack", line 138, in get_dev_info
    if len(drates):
UnboundLocalError: local variable 'drates' referenced before assignment

Setting importance to "Critical" since this involves a core component of Ubuntu Studio's audio subsystem just prior to final freeze.

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: studio-controls 2.2.5-0ubuntu1
ProcVersionSignature: Ubuntu 5.13.0-16.16-lowlatency 5.13.13
Uname: Linux 5.13.0-16-lowlatency x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu70
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Wed Oct 6 14:49:10 2021
InstallationDate: Installed on 2021-03-20 (199 days ago)
InstallationMedia: Ubuntu-Studio 21.04 "Hirsute Hippo" - Alpha amd64 (20210320)
PackageArchitecture: all
SourcePackage: studio-controls
UpgradeStatus: Upgraded to impish on 2021-06-13 (115 days ago)