- /lookup_cell and /detect_rogue rejected CID=0 towers because
`all([..., cid])` is falsy when cid=0; use `is not None` checks
- can_use_api() now returns False when GSM_OPENCELLID_API_KEY is empty,
preventing the geocoding worker from wasting daily quota on doomed calls
- /lookup_cell returns 503 with clear message when API key not configured
- parse_tshark_output uses rstrip('\n\r') instead of strip() to preserve
leading empty tab-separated fields (strip() ate leading tabs, shifting
all columns when the first field was empty)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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