When no GPU devices are present, 'lspci | grep -E VGA|Display|3D'
returns exit code 1 (no match), which triggered the ERR trap and
aborted the entire script with 'exit code 1: while executing command
grep -E VGA|Display|3D'.
Changes:
- Add '|| true' to the initial lspci|grep pipeline
- Early return with debug message when no GPU PCI devices found
- Replace 'echo \ | grep' with 'grep <<<\' (herestrings)
to avoid exit 1 from empty pipe on AMD/Intel/NVIDIA detection
c8f40bf49f