fix: don't assume there's always a reason for a package being filtered out

[G-Rath]

Currently if you don't provide a reason for an override the scanner will just output "because: " which looks weird and results in a trailing space in our snapshots which IDEs try to trim.

Since we want to encourage people to provide a reason, I've changed the scanner to explicitly state "(no reason provided)" in this situation

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.94%. Comparing base (84f1a96) to head (0167354).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1241   +/-   ##
=======================================
  Coverage   67.94%   67.94%           
=======================================
  Files         174      174           
  Lines       16838    16848   +10     
=======================================
+ Hits        11440    11448    +8     
- Misses       4765     4766    +1     
- Partials      633      634    +1     

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[cuixq]

LGTM