(NFC) tools/mixin/bin/test-all - Work-around segfault in CI

[totten]

Overview

This aims to address a segfault that currently arises on bknix-dfl/test-3. It only changes a test script and should have no impact on runtime.

cc @seamuslee001 @colemanw

[civibot]

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[demeritcowboy]

It still says "During parsing an error has been reported" even though it passes, but looks like it's just because there were no style checks performed.

Skip Files:
 * tools/mixin/bin/test-all
Style passed

[... then lots of boring stuff ...]

[CHECKSTYLE] Searching for all files in /home/jenkins/workspace/CiviCRM-Core-PR that match the pattern checkstyle/*.xml
[CHECKSTYLE] No files found. Configuration error?