Removed checking for descendant properties, because otherwise fallback

properties must always be from the same namespace (spring-projects#7986).

Author: thombergs

spring-boot/src/main/java/org/springframework/boot/context/properties/bind/Binder.java

@@ -209,6 +209,9 @@ private <T> T handleBindResult(ConfigurationPropertyName name, Bindable<T> targe
 			result = handler.onSuccess(name, target, context, result);
 			result = convert(result, target);
 		}
+		else {
+			result = handler.onNull(name, target, context);
+		}
 		handler.onFinish(name, target, context, result);
 		return convert(result, target);
 	}
@@ -237,9 +240,6 @@ private <T> T convert(Object value, Bindable<T> target) {
 	private <T> Object bindObject(ConfigurationPropertyName name, Bindable<T> target,
 			BindHandler handler, Context context) throws Exception {
 		ConfigurationProperty property = findProperty(name, context);
-		if (property == null && containsNoDescendantOf(context.streamSources(), name)) {
-			return null;
-		}
 		AggregateBinder<?> aggregateBinder = getAggregateBinder(target, context);
 		if (aggregateBinder != null) {
 			return bindAggregate(name, target, handler, context, aggregateBinder);
@@ -292,8 +292,7 @@ private <T> Object bindProperty(ConfigurationPropertyName name, Bindable<T> targ
 
 	private Object bindBean(ConfigurationPropertyName name, Bindable<?> target,
 			BindHandler handler, Context context) {
-		if (containsNoDescendantOf(context.streamSources(), name)
-				|| isUnbindableBean(name, target, context)) {
+		if (isUnbindableBean(name, target, context)) {
 			return null;
 		}
 		BeanPropertyBinder propertyBinder = (propertyName, propertyTarget) -> bind(
@@ -324,12 +323,6 @@ private boolean isUnbindableBean(ConfigurationPropertyName name, Bindable<?> tar
 		return packageName.startsWith("java.");
 	}
 
-	private boolean containsNoDescendantOf(Stream<ConfigurationPropertySource> sources,
-			ConfigurationPropertyName name) {
-		return sources.allMatch(
-				(s) -> s.containsDescendantOf(name) == ConfigurationPropertyState.ABSENT);
-	}
-
 	/**
 	 * Create a new {@link Binder} instance from the specified environment.
 	 * @param environment the environment source (must have attached