added missing space in error message

[maxi-w]

What does this PR do?

The PR adds a missing space in an error message.

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

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[codecov]

Codecov Report

Merging #1726 (5b2bfe0) into master (98bcf1a) will decrease coverage by 36%.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1726     +/-   ##
========================================
- Coverage      87%     51%    -36%     
========================================
  Files         250     250             
  Lines       14006   14008      +2     
========================================
- Hits        12249    7141   -5108     
- Misses       1757    6867   +5110