DMNRuntime API parameter nullcheck

        final DMNModel dmnModel = runtime.getModel("<wrong>", "<wrong>");
        // please notice an end-user of the API might not having checked the result of the previous call is not a null.
        DMNContext emptyContext = DMNFactory.newContext();
        DMNResult dmnResult = runtime.evaluateAll(dmnModel, emptyContext);

java.lang.NullPointerException
	at org.kie.dmn.core.impl.DMNRuntimeImpl.performRuntimeTypeCheck(DMNRuntimeImpl.java:622)
	at org.kie.dmn.core.impl.DMNRuntimeImpl.evaluateAll(DMNRuntimeImpl.java:118)
	at org.kie.dmn.core.DMNRuntimeTypeCheckTest.testMisleadingNPEbyAPIusage(DMNRuntimeTypeCheckTest.java:199)
...

java.lang.NullPointerException: Kie DMN API parameter 'model' cannot be null.
  at java.util.Objects.requireNonNull(Objects.java:290)
  at org.kie.dmn.core.impl.DMNRuntimeImpl.evaluateAll(DMNRuntimeImpl.java:123)
  at org.kie.dmn.core.DMNRuntimeTypeCheckTest.testMisleadingNPEbyAPIusage(DMNRuntimeTypeCheckTest.java:199)
...