ForeignKey column in Grid TagHelper does not initialize a DropDownList

[gdenchevprog]

Bug report

Reported in 1505921.

When a foreignkey column is initialized in a grid built with TagHelpers the DropDownList editor for this column does not appear when the row/cell is being edited.

Reproduction of the problem

Initialize a foreignkey column in an editable Tag Helper grid.

Current behavior

The foreignkey column does not have a DropDownList widget as it's editor.

Expected/desired behavior

The foreignkey column should have a DropDownList widget as it's editor.

Suggested solution

In the GridForeignKeyColumnSettingsTagHelper class the Values property should be checked for null values instead of the Data property.

Environment

• Kendo UI version: 2021.1.119
• jQuery version: 1.12.4
• Browser: [all]