Fix grepping formats for statpopgen

Signed-off-by: Adam Gutglick <[email protected]>

Author: AdamGS

.github/workflows/sql-benchmarks.yml

@@ -189,7 +189,7 @@ jobs:
           OTEL_RESOURCE_ATTRIBUTES: "bench-name=${{ matrix.id }}"
         run: |
           # Extract formats for each engine (filter out lance from df_formats)
-          df_formats=$(echo "${{ matrix.targets }}" | tr ',' '\n' | grep '^datafusion:' | grep -v ':lance$' | sed 's/datafusion://' | tr '\n' ',' | sed 's/,$//')
+          df_formats=$(echo "${{ matrix.targets }}" | tr ',' '\n' | grep '^datafusion:' | (grep -v ':lance$' || true) | sed 's/datafusion://' | tr '\n' ',' | sed 's/,$//')
           ddb_formats=$(echo "${{ matrix.targets }}" | tr ',' '\n' | grep '^duckdb:' | sed 's/duckdb://' | tr '\n' ',' | sed 's/,$//')
           has_lance=$(echo "${{ matrix.targets }}" | grep -q 'datafusion:lance' && echo "true" || echo "false")