[1.9.2] Export doesn't handle lists with no cards

[magikmw]

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Describe the bug
Export function doesn't output anything if the board being exported contains a list without any cards assigned.
Issue seems to be similar to the one solved here: #4566

To Reproduce
Steps to reproduce the behavior:

1. Go to Deck
2. Create a new deck containing at least two lists, and leave one of them empty
3. Try exporting via left panel 3 dot menu -> Export board
4. Nothing, except for an error in browser console:

Uncaught (in promise) TypeError: e.cards is undefined
    ht BoardApi.js:156
    ht BoardApi.js:156
    promise callback*value BoardApi.js:150
    actionExport AppNavigationBoard.vue:320
    VueJS 4
    onClick index.module.js:2
    VueJS 33

Expected behavior
Should export a board into CSV file.

Screenshots
n/a

Client details:

• OS: Windows 10 22H2
• Browser Firefox
• Version 114.02
• Device: desktop

I've left out server details, because I'm fairly sure it's JS related. Log in reproduction steps.

Using NC 26.0.3 and Deck 1.9.2