Fix for missing suite causing error in wdio-mocha-framework

[Joosakur]

Proposed changes

Adding a null-check to fix an earlier breaking change. Fixes #8973

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• I have added proper type definitions for new commands (if appropriate)

Further comments

Reviewers: @webdriverio/project-committers

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Joosakur / name: Joosa Kurvinen (503a2e0)

[christian-bromann]

Nice simple fix! Mind raising the same PR for the v7 branch so we can release it for the current stable version?

[christian-bromann]

Why did this PR get closed?

[Joosakur]

Why did this PR get closed?

I closed it as I first understood that I should have made the PR against v7 instead 😅 but got you now. I'll leave this open and create another fresh PR against the v7 branch later 👍

[christian-bromann]

LGTM, thank you! 👍