Extension-only queries (e.g. language:bg) return no results

[alltheseas]

Bug

Searching with only NIP-50 extensions like language:bg (no base search term) returns no results.

Steps to reproduce

1. Search: language:bg
2. Expected: Bulgarian-language notes
3. Actual: No results in Bg / results in e.g. English

Root cause

The query parsing pipeline extracts NIP-50 extensions (language:bg) from the query string, leaving an empty cleaned string. The empty string is falsy, so the search field is never set on the filter — the extensions are silently dropped.

Flow:

1. extractNip50Extensions("language:bg") → { cleaned: "", extensions: { language: "bg" } }
2. cleaned is empty → falsy → search field omitted from filter
3. buildSearchQueryWithExtensions("", { language: "bg" }) would produce "language:bg" but is never called

Fix

buildSearchQueryWithExtensions already handles empty base queries correctly (returns "language:bg"). The call site needs to pass "" instead of skipping when the base query is empty:

const searchQuery = buildSearchQueryWithExtensions(baseSearch || '', nip50Extensions) || undefined;

Note: This is already fixed on the perf/fixes-with-benchmarks branch (commit f640633).

[dergigi]

Resolved by #135 — extension-only queries (e.g. language:bg) now work when base query is empty.