Fix suggestion
requested to merge fix-suggestion-for-make-actionexecutor-more-servicelike into make-actionexecutor-more-servicelike
- Fixed merge errors (some code changes of branch 47-missing-unit-tests have been missing)
- Merged the two Pairs implementations into one
- Removed scope code smells in ScanClassPath
- Added catch block for NoSuchFileException in ScanClassPath to prevent error while unit tests runs on windows
- Added also null check for relay and client in ActionExecutor, so null tests are obsolete in any action test
- Fixed every test
- Removed ClientTest, because it was previously renamed in ClientIntegrationTest and was there twice