fix: nil pointer exceptions

[emmanuelgautier]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 56.46%. Comparing base (256db46) to head (ca1a921).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
scan/discover/utils.go	42.85%	3 Missing and 1 partial ⚠️
internal/request/response.go	90.90%	1 Missing ⚠️
internal/scan/scan_url.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #242   +/-   ##
=======================================
  Coverage   56.45%   56.46%           
=======================================
  Files          94       95    +1     
  Lines        3803     3813   +10     
=======================================
+ Hits         2147     2153    +6     
- Misses       1501     1503    +2     
- Partials      155      157    +2     

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