Fix Filter Assert message on callable without return type

[samsonasik]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (c45927f) to head (300522a).
⚠️ Report is 80 commits behind head on main.
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Additional details and impacted files

@@             Coverage Diff              @@
##                main       #42    +/-   ##
============================================
  Coverage     100.00%   100.00%            
- Complexity        45        87    +42     
============================================
  Files              4         8     +4     
  Lines            122       253   +131     
============================================
+ Hits             122       253   +131     

Flag	Coverage Δ
tests	100.00% <100.00%> (ø)

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