fix(ontology): cardinality of one can be added to classes as long as not used in data #1958
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resolves DEV-233
It is now possible to add a cardinality to a class even if it has a subclass. This is only allowed if that class or any sub-class (recursively) is not yet used in data, i.e. has no resource instantiated from it. Therefore I added a new check
isClassUsedInData
.