terminal: handle BlockingIOError in addition to TypeError

[panlinux]

Description

Handle BlockingIOError in addition to TypeError for non-blocking read() in terminal.py, since python 3.14 raises BlockingIOError[1] instead of TypeError when there is nothing to read.

LP: #2138802

1. https://docs.python.org/dev/whatsnew/3.14.html#io

Checklist

• Runs make check successfully.
• Retains code coverage (make check-coverage).
• New/changed keys in YAML format are documented.
• (Optional) Adds example YAML for new feature.
• (Optional) Closes an open bug in Launchpad.

[panlinux]

Debian error:
E: Couldn't find these debs: isc-dhcp-client

Redhat error:

Configuring _netplan_cffi.c with command

python-cffi/netplan/meson.build:8:12: ERROR: Command `/usr/sbin/python3 /__w/netplan/netplan/python-cffi/netplan/_build_cffi.py /__w/netplan/netplan/include /__w/netplan/netplan/redhat-linux-build/python-cffi/netplan/src` failed with status 1.

A full log can be found at /__w/netplan/netplan/redhat-linux-build/meson-logs/meson-log.txt
error: Bad exit status from /var/tmp/rpm-tmp.zxyq49 (%build)
    Bad exit status from /var/tmp/rpm-tmp.zxyq49 (%build)

RPM build errors:
Error: Process completed with exit code 1.

Are these "normal" failures from the CI?

[slyon]

Are these "normal" failures from the CI?

Yes, those are unrelated.