isRefreshScoped returns false if beanName is null

Refer to notes in https://github.com/spring-cloud/spring-cloud-commons/issues/49 for details

spring-cloud-context/src/main/java/org/springframework/cloud/context/properties/ConfigurationPropertiesRebinder.java

@@ -122,7 +122,7 @@ ApplicationListener<EnvironmentChangeEvent>, ApplicationContextAware {
 				}
 			}
 		}
-		if (this.refreshScope == null) {
+		if (beanName == null || this.refreshScope == null) {
 			return false;
 		}
 		return this.beanFactory.containsBeanDefinition(beanName)