ip一键对比 bug修复

@@ -148,6 +148,7 @@ public class CompareCtrl {
                 serversExecutor.shutdownNow();
             }
         }
+        LOGGER.info("check ip tasks is over.");
         resp.setData(compareResults);
         return resp;
     }

@@ -125,6 +125,10 @@ public class ServiceCompare {
 
         String ips = StringUtils.substringBetween(destLine, "=(", ")");
 
+        if(StringUtils.isBlank(ips)){
+            return ipList;
+        }
+
         String[] ipArray = ips.split("master@");
 
         if (null == ipArray) {