storage: Don't panic if storage has no FPs even after initial wait
@@ -1341,7 +1341,7 @@ func (s *MemorySeriesStorage) cycleThroughMemoryFingerprints() chan model.Finger
}
begin := time.Now()
fps := s.fpToSeries.sortedFPs()
- if firstPass {
+ if firstPass && len(fps) > 0 {
// Start first pass at a random location in the
// key space to cover the whole key space even
// in the case of frequent restarts.
