Do not fail with 500 error when unknown HTTP verb is sent

[benoit74]

Rationale

Fix #838

Changes

• simply handle the fact that HTTP verb might be unknown in BaseRoute class

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.21%. Comparing base (9ad012b) to head (2448e28).
Report is 4 commits behind head on main.

Files	Patch %	Lines
dispatcher/backend/src/routes/base.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1001      +/-   ##
==========================================
+ Coverage   88.14%   88.21%   +0.07%     
==========================================
  Files          94       95       +1     
  Lines        5312     5331      +19     
==========================================
+ Hits         4682     4703      +21     
+ Misses        630      628       -2     

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