Kendo-angular: TileLayout Component not providing an optional header / title results in classList null error

[wasdJens]

Describe the bug
When using the TileLayout Component and not providing a TileLayoutItemHeader component OR title input the following error is displayed in the developer console of the browser.

To Reproduce
https://stackblitz.com/edit/angular-sqpkka-fzdsit?devtoolsheight=33&file=app/app.component.ts

Expected behavior
According to the official documentation the header is optional. For me personally it would help to make it clear that in this case the title attribute is required or a better error message is shown to indicate that a configuration step for the tile layout is missing.

header(Optional) - Configured either by passing a string to the title configuration option of the TileLayoutItem or by nesting a element of type TileLayoutItemHeader inside the tile. Both approaches will result in rendering a header section above the body.

Also the header is only required if used with the reorderable option (Which is disabled in my example above)

The header section of the tiles is required if the reorderable option of the TileLayout component is enabled. End-users will be able to drag the tiles through their headers.

Screenshots
See above.

Browser

• OS: Windows 10
• Browser Microsoft Edge
• Version Version 88.0.705.74 (Offizielles Build) (64-Bit)

Additional context
Background: I wanted to create a tile without a title / header (Only a body) - I solved my problem by just using the header component since it was only a small text that was displayed.

[dtopalov]

The fix is available in the latest dev version of the @progress/kendo-angular-layout package.

[Raisolution]

An official version 6.1.3 of the package has been released.