Fix bug I introduced by trying to get smart

Author: glasserc

src/utils.js

@@ -422,7 +422,7 @@ function resolveDependencies(schema, definitions, formData) {
  // Process dependencies updating the local schema properties as appropriate.
  for (const dependencyKey in dependencies) {
  // Skip this dependency if its trigger property is not present.
- if (!formData.hasOwnProperty(dependencyKey)) {
+ if (formData[dependencyKey] === undefined) {
  continue;
  }
  const dependencyValue = dependencies[dependencyKey];