message: fix elementAspect test
diff: @@ -43,7 +43,7 @@ describe("ElementAspect", () => {
  assert.isTrue(aspect2 instanceof ElementUniqueAspect);
  assert.equal(aspect2.classFullName, "DgnPlatformTest:TestUniqueAspect");
  assert.equal(aspect2.testUniqueAspectProperty, "Aspect2-Updated");
  - assert.isNull(aspect2.length);
  + assert.isUndefined(aspect2.length);
  assert.isTrue(Object.isFrozen(aspect2));
  const multiAspectsA: ElementMultiAspect[] = await element.getMultiAspects("DgnPlatformTest:TestMultiAspectNoHandler");
  