[TRIVIAL] Do not log on the found misbehaving solvers empty collection (

#3304)

Currently, the log produces a lot of noise and should not be printed on
the empty collection.

crates/autopilot/src/domain/competition/participation_guard/db.rs

@@ -183,6 +183,10 @@ impl SolverValidator {
             })
             .collect();
 
+        if non_settling_solver_names.is_empty() {
+            return;
+        }
+
         let log_message = match ban_reason {
             dto::notify::BanReason::UnsettledConsecutiveAuctions => "found non-settling solvers",
             dto::notify::BanReason::HighSettleFailureRate => {