fix: handle rounds with zero retrieval tasks

lib/tasker.js

@@ -33,9 +33,11 @@ export async function getTasksAllowedForStations (roundDetails, randomness, meas
     if (tasksAllowedForStations.has(m.stationId)) continue
 
     const stationKey = await getStationKey(m.stationId)
-    const allowedTasks = seeker
-      .wHeap(stationKey, numberOfTasksToPick)
-      .map(({ key, ...t }) => (t))
+    const allowedTasks = numberOfTasksToPick
+      ? seeker
+        .wHeap(stationKey, numberOfTasksToPick)
+        .map(({ key, ...t }) => (t))
+      : []
     tasksAllowedForStations.set(m.stationId, allowedTasks)
   }
 

test/tasker.test.js

@@ -78,4 +78,17 @@ describe('tasksAllowedForStations', async () => {
 
     assert.strictEqual(tasksAllowedForStations.get(VALID_MEASUREMENT.stationId)?.length, 2)
   })
+
+  it('handles round with zero tasks', async () => {
+    /** @type {Measurement[]} */
+    const measurements = [VALID_MEASUREMENT]
+
+    const tasksAllowedForStations = await getTasksAllowedForStations(
+      { retrievalTasks: [], maxTasksPerNode: 0 },
+      RANDOMNESS,
+      measurements
+    )
+
+    assert.strictEqual(tasksAllowedForStations.get(VALID_MEASUREMENT.stationId)?.length, 0)
+  })
 })