Fix warning given if no events are written and task is resting state

[skjerns]

PR Description

There was a warning given when write_raw_bids(...) when no events were provided. This was a simple mistake in if logic. Replacing the or with and fixed this.

I don't think that a test is necessary for this minor bug

resolves #1324

Merge checklist

Maintainer, please confirm the following before merging.
If applicable:

• All comments are resolved
• This is not your own PR
• All CIs are happy
• PR title starts with [MRG]
• whats_new.rst is updated
• New contributors have been added to CITATION.cff
• PR description includes phrase "closes <#issue-number>"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.47%. Comparing base (c1d59ec) to head (4889ff8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1327   +/-   ##
=======================================
  Coverage   97.47%   97.47%           
=======================================
  Files          40       40           
  Lines        8876     8876           
=======================================
  Hits         8652     8652           
  Misses        224      224           

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[sappelhoff]

Thanks!