5.5.3 changed the behavior of CollectRows on an empty result

[its-felix]

Describe the bug
Since version 5.5.3 with the introduction of a57bb8c , the behavior of CollectRows changed. It now returns a nil slice if the passed Rows contains no rows.

To Reproduce

• Query something that doesn't return any rows
• Use pgx.CollectRows
• nil slice is returned

Expected behavior
An empty slice should be returned

Actual behavior
A nil slice is returned

Version

• Go: 1.21
• PostgreSQL: CockroachDB 23.1.15
• pgx: 5.5.3

Additional context
N/A