Apply isPresent to the source property

Author: perrin4869

lib/types/keys.js

@@ -144,8 +144,7 @@ module.exports = Any.extend({
 
         if (schema.$_terms.dependencies) {
             for (const dep of schema.$_terms.dependencies) {
-                if (dep.key &&
-                    dep.key.resolve(value, state, prefs, null, { shadow: false }) === undefined) {
+                if (!internals.isPresent(dep.key && dep.key.resolve(value, state, prefs, null, { shadow: false }), dep.options)) {
 
                     continue;
                 }