Custom dialogs demo errors when you open the inputs category

[BeksOmega]

Category

• Examples

Component

The custom dialogs demo

Describe the bug

When you open the inputs category, you get an error, causing the demo to break.

Also messages are broken in this one as well.

To Reproduce

Steps to reproduce the behavior:

1. Open the custom dialogs demo.
2. Open the inputs category.
3. Observe the error in the console and how you can't drag blocks from the flyout.

Expected behavior

No errors.

Also messages being dereferenced.

Additional context

field_dropdown.js:397 Uncaught TypeError: Cannot read properties of undefined (reading 'alt')
    at FieldDropdown.$.module$exports$Blockly$FieldDropdown.FieldDropdown.trimOptions_ (field_dropdown.js:397:19)
    at new FieldDropdown (field_dropdown.js:154:10)
    at BlockSvg.init (text.js:487:22)
    at BlockSvg.module$exports$Blockly$Block.Block.doInit_ (block.js:358:14)
    at new BlockSvg (block_svg.js:263:10)
    at WorkspaceSvg.module$exports$Blockly$WorkspaceSvg.WorkspaceSvg.newBlock (workspace_svg.js:1042:12)
    at module$contents$Blockly$Xml_domToBlockHeadless (xml.js:928:21)
    at $.module$exports$Blockly$Xml.domToBlock (xml.js:605:16)
    at VerticalFlyout.module$exports$Blockly$Flyout.Flyout.createFlyoutBlock_ (flyout_base.js:744:17)
    at VerticalFlyout.module$exports$Blockly$Flyout.Flyout.createFlyoutInfo_ (flyout_base.js:658:30)