Fix NPE on incoming DataTransferRequest

[TomMarkuske]

DataTransferRequests can be both initiated by the charge point as well
as the central system.

Using the ClientCoreProfile, a received DataTransferRequest cannot be
handled because the owning profile is unset.

Fix this by setting the owning profile.

[codecov-commenter]

Codecov Report

Merging #122 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #122   +/-   ##
=========================================
  Coverage     41.53%   41.53%           
  Complexity      911      911           
=========================================
  Files           220      220           
  Lines          4355     4355           
  Branches        437      437           
=========================================
  Hits           1809     1809           
  Misses         2438     2438           
  Partials        108      108           

[coveralls]

Coverage remained the same at 42.781% when pulling 60c134e on TomMarkuske:master into 9e8f2c0 on ChargeTimeEU:master.

[TVolden]

Hi @TomMarkuske,

Thanks for the contribution. It's merged in.