Markets-widget fails to show daily change for some symbols

[Joppeur]

Markets widget doesn't show day change properly for all symbols.
Glance version: 0.8.4

In this screenshot, ASWC.DE should display -2.29%

Actual day change of ASWC.DE from Yahoo Finance:

I speculate it might have to do with Yahoo Finance sometimes returning null values in response at: result.Indicators.Quote[0].Close, for example:

ASWC.DE Yahoo API reponse with null values:
https://query1.finance.yahoo.com/v8/finance/chart/aswc.de?range=1mo&interval=1d

DFEN.DE Yahoo API response with no null values:
https://query1.finance.yahoo.com/v8/finance/chart/dfen.de?range=1mo&interval=1d

Steps to reproduce:

Can be unreliable, depending if Yahoo API returns null values or not.

1. Add markets widget to glance.yml with these symbols:

- type: markets
  markets:
    - symbol: SPYI.DE
      name: SPYI
    - symbol: QDVE.DE
      name: S&P IT
    - symbol: ASWC.DE
      name: Future of Defence
    - symbol: DFEN.DE
      name: VanEck Defense

2. Check whether Glance dashboard incorrectly displays +0.00% for any of the symbols.

Full JSONs for ASWC.DE and DFEN.DE:

dfen.de.json
qdve.de.json

[svilenmarkov]

Related to #785, like you speculated it's an issue with Yahoo's API. Nothing to do other than give them some time to sort it out.