Fix undefined offset on redis session

[spinsch]

Description

In most cases it will never be a problem, but in test environments with the highest error level it will not work.
list() wants numeric arrays

Manual testing scenarios

1. Visit a page

Questions or comments

Prerequisite

• Run php with error_reporting = E_ALL
• Configure redis as session backend

ENV

• PHP 7.3.22
• Redis 6.05

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All automated tests passed successfully (all builds are green)

[joshua-bn]

Weird. I'm on 7.4 with E_ALL and don't have this issue.

[Serjudo]

In my case with PHP 7.2, I have the following errors in system.log

2020-10-20T16:22:09+02:00 ERR (3): Notice: Undefined offset: 0 in /home/wwwpapelstore/public_html/lib/Cm/Cache/Backend/Redis.php on line 799

2020-10-20T16:22:09+02:00 ERR (3): Notice: Undefined offset: 1 in /home/wwwpapelstore/public_html/lib/Cm/Cache/Backend/Redis.php on line 799

2020-10-20T16:22:09+02:00 ERR (3): Notice: Undefined offset: 2 in /home/wwwpapelstore/public_html/lib/Cm/Cache/Backend/Redis.php on line 799

[Flyingmana]

Described more in depth in the related PR #1705
As this is a repeating issue/fix now, I count this as one approved Review.

[github-actions]

Unit Test Results

1 files  1 suites   0s ⏱️
0 tests 0 ✔️ 0 💤 0 ❌
6 runs  4 ✔️ 2 💤 0 ❌

Results for commit 9b425f4.