Debug log message when no bearer header found in request

[tomneedham]

To aid debugging when apache/$webserver/$proxy strips the auth headers.

[codecov[bot]]

Codecov Report

Merging #141 into master will increase coverage by 0.02%. The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #141      +/-   ##
============================================
+ Coverage     82.12%   82.15%   +0.02%     
  Complexity      199      199              
============================================
  Files            21       21              
  Lines           705      706       +1     
============================================
+ Hits            579      580       +1     
  Misses          126      126

Impacted Files	Coverage Δ	Complexity Δ
lib/AuthModule.php	89.28% <100%> (+0.39%)	8 <0> (ø)	:arrow_down:

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