Chart does not render graph for items without label

[SnoutBug]

Actual behaviour

Chart does not render graph for items without label

Expected behaviour

Chart renders graph regardless or throws error

Steps to reproduce

1. create item
2. don't add label
3. add chart to sitemap
4. go to said site in android app
5. notice the chart appearsy but no graph is drawn

Environment data

Client

• Android version: 16
• Device model: GOS
• App version 3.19.8
• Build flavor : Foss
• Device language: EN

Server

• Server version: 5.1.0
• Reverse Proxy: nginx
• Authentication method : user, password

Logs

App log

Click to expand

Might add later if needed - they are quite long and most is not relevant