On VM installs (e.g. Proxmox) the RaspiBlitz monitor scripts don't
populate keys like system_cpu_load / system_ram_mb / system_temp_celsius,
so redis returns empty strings. get_hardware_info did int('')/float('')
and raised ValueError, which killed the _handle_gather_hardware_info
background task ('Task exception was never retrieved') - hardware SSE
updates then stopped until restart.
- parse the hardware Redis values via _safe_int/_safe_float, returning
zero values instead of crashing (and guard the vram-percent division
by zero)
- wrap the gatherer loop body in try/except so a single failure can no
longer kill the task
Fixes#271
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
