Bug#972058: libtickit-perl autopkgtest failure.

[peter green]

Package: libtickit-perl
Version: 0.71-1
Severity: serious

The libtickit-perl autopkgtest is failing on the unstable->testing migration tests (the plain unstable tests are not
up to date enough to be useful). On i386 and amd64 this failure is a regression (on the other architectures where
autopkgtest runs the tests also fail in plain testing, so it's "not a regression"). This is preventing the libtickit transition from fully completing in
testing.

https://ci.debian.net/data/autopkgtest/testing/amd64/libt/libtickit-perl/7392469/log.gz
> t/81tickit-io.t ........... 
> Use of uninitialized value in subroutine entry at /usr/lib/x86_64-linux-gnu/perl5/5.30/Tickit/Term.pm line 117.
> Cannot construct Tickit::Term - No such file or directory at /usr/lib/x86_64-linux-gnu/perl5/5.30/Tickit.pm line 142.
> Dubious, test returned 2 (wstat 512, 0x200)
> No subtests run 
<--snip-->
> Test Summary Report
> -------------------
> t/81tickit-io.t         (Wstat: 512 Tests: 0 Failed: 0)
>   Non-zero exit status: 2
>   Parse errors: No plan found in TAP output
> Files=31, Tests=746,  3 wallclock secs ( 0.16 usr  0.03 sys +  2.16 cusr  0.33 csys =  2.68 CPU)
> Result: FAIL
> autopkgtest [14:09:34]: test autodep8-perl-build-deps: -----------------------]
> autopkgtest [14:09:34]: test autodep8-perl-build-deps:  - - - - - - - - - - results - - - - - - - - - -
> autodep8-perl-build-deps FAIL non-zero exit status 1