Merge pull request #5811 from dataease/pr@dev@fix_linkage-error

fix(仪表板): 修复仪表板空属性联动时被联动视图出现报错问题

backend/src/main/java/io/dataease/provider/query/SQLUtils.java

@@ -5,6 +5,10 @@ package io.dataease.provider.query;
  */
 public class SQLUtils {
     public static String transKeyword(String value) {
-        return value.replaceAll("'", "\\\\'");
+        if(value == null){
+            return null;
+        }else{
+            return value.replaceAll("'", "\\\\'");
+        }
     }
 }