Missing '.thresholds' in `config.yaml` result in 'assignment to entry in nil map'

[karunsiri]

Describe the bug
the .thresholds key is required to be present the default config file at $XDG_CONFIG/k9s/config.yaml

To Reproduce

1. Copy the default configuration (config.yaml) from https://k9scli.io/topics/config/
2. remove .shellPods.tty because k9s doesn't accept this config (another bug than this one)
3. remove the .thresholds key from the config
4. Start k9s and see the error assignment to entry in nil map
5. Add .thresholds back to the config
6. Start k9s and now it's working properly

Historical Documents

Expected behavior
k9s starts successfully with default configurations

Screenshots

Versions (please complete the following information):

• OS: Fedora 38. Linux kernel 6.6
• K9s: 0.31.1
• K8s: 1.28.4

Additional context
all configs under ~/.config/k9s and ~/.local/share/k9s are deleted prior to issuing a k9s 0.31.1 command.

[karunsiri]

Here is the actual config I used:

k9s:
  refreshRate: 2
  maxConnRetry: 3
  readOnly: false
  noExitOnCtrlC: false
  skipLatestRevCheck: false

  ui:
    headless: false
    logoless: true
    crumbsless: false
    noIcons: false
    enableMouse: false
    skin: onedark

  logger:
    tail: 100
    buffer: 5000
    sinceSeconds: 300
    fullScreen: false
    textWrap: false
    showTime: false

  shellPod: &shellpod
    image: busybox:1.36.1
    namespace: default
    limits:
      cpu: 100m
      memory: 100Mi

[derailed]

Fixed v0.31.2