AttributeRelation: void-attributes deletable

(cherry picked from commit 52f294b3)

entity/AttributeRelation_entity/entityfields/value/valueProcess.js

@@ -6,4 +6,6 @@ import("system.result");
 var attributeType = vars.get("$field.ATTRIBUTE_TYPE");
 var contentType = AttributeTypeUtil.getContentType(attributeType);
 if (!vars.get("$this.value") && contentType == "BOOLEAN")
-    result.string("0");
\ No newline at end of file
+    result.string("0");
+else if (!contentType)
+    result.string("");
\ No newline at end of file

entity/AttributeRelation_entity/recordcontainers/jdito/onDelete.js

@@ -4,7 +4,7 @@ import("Sql_lib");
 import("system.db");
 
 var rowData = vars.get("$local.rowdata");
-if (rowData["AB_ATTRIBUTE_ID.value"] && rowData["VALUE.value"])
+if (rowData["AB_ATTRIBUTE_ID.value"])
 {
     db.deleteData("AB_ATTRIBUTERELATION", SqlCondition.equals("AB_ATTRIBUTERELATION.AB_ATTRIBUTERELATIONID", vars.get("$local.uid"), "1=2"));
 }
\ No newline at end of file