dom.applyFeatureClass tests: Fix negative test
dom.applyFeatureClass tests: Fix negative test

Test wasn't actually _calling_ applyFeatureClass, which is why
istanbul was claiming that the else branch wasn't taken.

dojo/dom,baw/dojo-dom,vansimke/dom,vansimke/dom,baw/dojo-dom,dojo/dom,baw/dojo-dom,dojo/dom,vansimke/dom