fix(mm): skip prewarming ats if no nodes booted (#970)

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## Changes

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svc/pkg/mm-config/ops/version-prepare/src/prewarm_ats.rs

@@ -72,7 +72,9 @@ pub async fn prewarm_ats_cache(
 		let mut vlan_ips_in_region = vlan_ips.iter().filter(|row| row.datacenter_id == region_id);
 		let vlan_ip_count = vlan_ips_in_region.clone().count() as i64;
 
-		ensure!(vlan_ip_count != 0, "no ats servers found");
+		if vlan_ip_count == 0 {
+			continue;
+		}
 
 		// Pass artifact URLs to the job
 		let parameters = prewarm_ctx