fix(router): check for nil logger

[piksel]

use a safe logging wrapper to avoid dereferencing a nil logger inside the router

fixes #186

[codecov]

Codecov Report

Merging #189 (18c3abe) into main (57b43a3) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #189      +/-   ##
==========================================
+ Coverage   64.06%   64.18%   +0.11%     
==========================================
  Files          86       87       +1     
  Lines        2758     2770      +12     
==========================================
+ Hits         1767     1778      +11     
- Misses        839      840       +1     
  Partials      152      152              

Impacted Files	Coverage Δ
pkg/router/router.go	67.34% <100.00%> (+1.03%)	⬆️
pkg/services/teams/teams.go	74.00% <0.00%> (-1.52%)	⬇️
pkg/util/docs.go	100.00% <0.00%> (ø)
pkg/services/teams/teams_config.go	82.25% <0.00%> (+1.55%)	⬆️

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