WAF规则中如果对比值为空，则显示空字样

web/public/js/components/server/http-firewall-rule-label.js

@@ -21,6 +21,9 @@ Vue.component("http-firewall-rule-label", {
 			}
 
 			return operatorName
+		},
+		isEmptyString: function (v) {
+			return typeof v == "string" && v.length == 0
 		}
 	},
 	template: `<div>
@@ -41,7 +44,8 @@ Vue.component("http-firewall-rule-label", {
 		<span v-else>
 			<span v-if="rule.paramFilters != null && rule.paramFilters.length > 0" v-for="paramFilter in rule.paramFilters"> | {{paramFilter.code}}</span> 
 		<span :class="{dash:rule.isCaseInsensitive}" :title="rule.isCaseInsensitive ? '大小写不敏感':''" v-if="!rule.isComposed">{{operatorName(rule.operator)}}</span> 
-		{{rule.value}}
+			<span v-if="!isEmptyString(rule.value)">{{rule.value}}</span>
+			<span v-else class="disabled" style="font-weight: normal" title="空字符串">[空]</span>
 		</span>
 		
 		<!-- description -->