use build_empty() where we can

Author: jgallagher

nexus/db-queries/src/db/datastore/vpc.rs

@@ -3312,10 +3312,7 @@ mod tests {
         };
 
         // Create an initial, empty blueprint, and make it the target.
-        let bp0 = BlueprintBuilder::build_empty_with_sleds(
-            sled_ids.iter().copied(),
-            "test",
-        );
+        let bp0 = BlueprintBuilder::build_empty("test");
         bp_insert_and_make_target(&opctx, &datastore, &bp0).await;
 
         // Our blueprint doesn't describe any services, so we shouldn't find any

nexus/src/app/background/tasks/crdb_node_id_collector.rs

@@ -401,10 +401,7 @@ mod tests {
         let db = TestDatabase::new_with_datastore(&logctx.log).await;
         let (opctx, datastore) = (db.opctx(), db.datastore());
 
-        let blueprint = BlueprintBuilder::build_empty_with_sleds(
-            iter::once(SledUuid::new_v4()),
-            "test",
-        );
+        let blueprint = BlueprintBuilder::build_empty("test");
         let blueprint_target = BlueprintTarget {
             target_id: blueprint.id,
             enabled: true,
@@ -464,10 +461,7 @@ mod tests {
         let db = TestDatabase::new_with_datastore(&logctx.log).await;
         let (opctx, datastore) = (db.opctx(), db.datastore());
 
-        let blueprint = BlueprintBuilder::build_empty_with_sleds(
-            iter::once(SledUuid::new_v4()),
-            "test",
-        );
+        let blueprint = BlueprintBuilder::build_empty("test");
         let blueprint_target = BlueprintTarget {
             target_id: blueprint.id,
             enabled: true,