SingleLinePlot crashes with Cannot read properties of undefined (reading 'ts')

[bladealex9848]

Bug: sysinfo widget crashes when metrics data is undefined

Error:

TypeError: Cannot read properties of undefined (reading 'ts')
    at SingleLinePlot (index-DmgZSJE4.js:107274:44)

Steps:

1. Connect to remote VPS
2. Open sysinfo widget
3. Widget crashes

Environment:

• Wave version: [add yours from About menu]
• OS: macOS

Expected: Graceful handling of missing data
Actual: Complete widget crash