fix(anomaly-detection): Handle illegal padding amount (#1136)

- Util raises exception if requested length for padding is less than
current mp_dist array

Note: is there a more graceful way to handle this?

src/seer/anomaly_detection/detectors/mp_utils.py

@@ -42,6 +42,10 @@ def get_mp_dist_from_mp(
  mp_dist = normalizer.normalize(mp_dist)
 
  if pad_to_len is not None:
+ if pad_to_len < len(mp_dist):
+ raise Exception(
+ "Requested length should be greater than or equal to current mp_dist"
+ )
  nan_value_count = np.empty(pad_to_len - len(mp_dist))
  nan_value_count.fill(np.nan)
  mp_dist_updated = np.concatenate((nan_value_count, mp_dist))