fix attributeRelationCondition

entity/AttributeRelation_entity/recordcontainers/jdito/contentProcess.js

+import("system.logging");
 import("system.util");
 import("Util_lib");
 import("system.vars");
@@ -56,9 +57,11 @@ else if (showEmpty || rowId)
         attributeRelationJoin += " and " + subCondition;
         sqlCondition.preparedValues = subCondition.preparedValues.concat(sqlCondition.preparedValues);
     }
-    if (vars.exists("$param.FilteredAttributeIds_param") && vars.get("$param.FilteredAttributeIds_param"))
+    if (vars.exists("$param.FilteredAttributeIds_param") && vars.getString("$param.FilteredAttributeIds_param"))
     {
         let filteredIds = JSON.parse(vars.getString("$param.FilteredAttributeIds_param"));
+                logging.log(filteredIds.toSource())
+
         subCondition.clear();
         let filteredIdChildren = AttributeUtil.getAllChildren(filteredIds);
 
@@ -67,7 +70,8 @@ else if (showEmpty || rowId)
             this.orPrepare("AB_ATTRIBUTE.AB_ATTRIBUTEID", id);
         }, subCondition);
 
-        sqlCondition.andSqlCondition(subCondition);
+        // return nothing if filteredAttributeIds is an empty array. (--> and 1=2)
+        sqlCondition.andSqlCondition(subCondition, "1=2");
     }
 }