Missing value attribute in process variables as tag list options breaks the tag list

[christian-konrad]

Describe the Bug

When I feed process variables as tag list options, I must specify a list of key-value pairs, where I must provide both a value and a label for each select option. If I miss a value, it breaks the tag list: the value is still offered as a choice, but if I select it, it won't appear in the list of tags, but adds a null value to the output.

Additionally, the hint in the properties panel does not help me to understand in which format I need to provide the select options.

Steps to Reproduce

Best to be done in the playground.

1. Provide a list of maps that contains at least one select option entry that does not have a value attribute
2. Assign this map to a tag list component as the "value" input (actually the options input, name is confusing here)
3. Select the item in the tag list and check the output

Also see the video.

Bildschirmaufnahme.2022-08-08.um.14.41.06.mov

Expected Behavior

In addition to fix the faulty behavior itself, we should add a hint in the properties panel on how to configure it: #305

Environment

• Host (Browser/Node version), if applicable: [e.g. MS Edge 18, Chrome 69, Node 10 LTS]
• OS: [e.g. Windows 7]
• Library version: [e.g. 2.0.0]

[smbea]

Bug fix: #315
Description improvement: #316