fix url absolute check

[hahn-kev]

closes #1238

[github-actions[bot]]

C# Unit Tests

90 tests  ±0   90 :white_check_mark: ±0   5s :stopwatch: ±0s 14 suites ±0    0 :zzz: ±0   1 files   ±0    0 :x: ±0 

Results for commit be2d8587. ± Comparison against base commit 10a107f1.