Add null bean property test

Covers the null-return path in `ConfigurationPropertyUtils#newConfigurationPropertiesBeanProperty` by asserting an instance `Bindable` does not produce a bean property.

Author: mercyblitz

microsphere-spring-boot-core/src/test/java/io/microsphere/spring/boot/context/properties/source/util/ConfigurationPropertyUtilsTest.java

@@ -42,6 +42,7 @@
 import static org.junit.jupiter.api.Assertions.assertSame;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
+import static org.springframework.boot.context.properties.bind.Bindable.ofInstance;
 import static org.springframework.boot.context.properties.source.ConfigurationPropertyName.EMPTY;
 import static org.springframework.boot.context.properties.source.ConfigurationPropertyName.of;
 
@@ -112,4 +113,10 @@ public void onSuccess(ConfigurationPropertyName name, Bindable<?> target, BindCo
         });
         assertNotNull(serverProperties);
     }
+
+    @Test
+    void testNewConfigurationPropertiesBeanPropertyOnNull() {
+        Bindable<String> bindable = ofInstance("test");
+        assertNull(newConfigurationPropertiesBeanProperty(bindable));
+    }
 }