Move alias check before custom handler check

[ghost]

Move alias check before custom handler check.

Checklist

• I have read contributing guidelines

• I'm sure that I did not unrelated changes in this pull request

• I have created at least one test case for the changes I have made

• I have added myself to the CONTRIBUTORS.rst

• I have added my changes to the CHANGELOG.rst

Related issues

Closes #1514

[codecov]

Codecov Report

Merging #1515 (e8186c6) into master (c87af6d) will decrease coverage by 0.05%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1515      +/-   ##
==========================================
- Coverage   57.08%   57.04%   -0.05%     
==========================================
  Files          60       60              
  Lines        2123     2123              
==========================================
- Hits         1212     1211       -1     
- Misses        911      912       +1     

[ghost]

Hmm.. do you have any guidance on why the coverage results changed?
When running coverage locally, I don't see any change.

[lk-geimfari]

Hmm.. do you have any guidance on why the coverage results changed?

When running coverage locally, I don't see any change.

See #1489