GRAILS-7031 - improve test method name

Author: jeffscottbrown

src/test/org/codehaus/groovy/grails/web/taglib/ValidationTagLibTests.groovy

@@ -380,7 +380,7 @@ enum Title implements org.springframework.context.MessageSourceResolvable {
         assertOutputEquals("The Default Message", template, [message: resolvable])
     }
 
-	void testDefaultMessageAttribute() {
+	void testDefaultMessageAttributeWithAnEmptyStringValue() {
 		def template  = '<g:message code="my.message.code" default=""/>'
 		assertOutputEquals "", template
 	}