All test are skipped but suite is not failed

[bpross-52n]

Describe the bug
When all tests of a core conformance class are skipped, the cite:areCoreConformanceClassesPassed property is still set to true.

To Reproduce
Steps to reproduce the behavior:
Execute a test suite where all core conformance tests are skipped. The cite:areCoreConformanceClassesPassed of the RDF report will be set to true. Also, the html view will show that the core conformance classes were passed.

Additional context
See also here: opengeospatial/ets-ogcapi-processes10#99