grep -c returns exit code 1 when no matches found (even though it
outputs 0), causing `|| echo 0` to append an extra 0 and corrupt
the JSON response. This broke ubus calls and LuCI status display.
Use `: ${var:=0}` pattern instead to provide defaults.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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