+解析逻辑

msg-center-common/src/main/java/cn/axzo/msg/center/common/utils/PlaceholderResolver.java

@@ -137,6 +137,9 @@ public class PlaceholderResolver {
     StringBuilder result = new StringBuilder(content);
     while (start != -1) {
       int end = result.indexOf(this.placeholderSuffix, start);
+      if(end == -1){
+        return result.toString();
+      }
       //获取占位符属性值，如${id}, 即获取id
       String placeholder = result.substring(start + this.placeholderPrefix.length(), end);
       //替换整个占位符内容，即将${id}值替换为替换规则回调中的内容