warn if changing mjd on conditions

rubin_sim/scheduler/detailers/detailer.py

@@ -218,7 +218,10 @@ def __call__(self, observation_list, conditions):
 
         # Find the closest in angular distance of the points that are in band
         ang_dist = _angular_separation(az[in_band], alt[in_band], conditions.tel_az, conditions.tel_alt)
-        good = np.min(np.where(ang_dist == ang_dist.min())[0])
+        if np.size(ang_dist) == 1:
+            good = 0
+        else:
+            good = np.min(np.where(ang_dist == ang_dist.min())[0])
         indx = in_band[good]
         result = observation_list[indx:] + observation_list[:indx]
         return result

rubin_sim/scheduler/features/conditions.py

@@ -1,5 +1,6 @@
 __all__ = ("Conditions",)
 
+import warnings
 from io import StringIO
 
 import healpy as hp
@@ -393,6 +394,8 @@ def mjd(self):
     @mjd.setter
     def mjd(self, value):
         # If MJD is changed, everything else is no longer valid, so re-init
+        if self.mjd is not None:
+            warnings.warn("Changing MJD and resetting all attributes.")
         self._init_attributes()
         self._mjd = value
 

rubin_sim/scheduler/surveys/long_gap_survey.py

@@ -99,10 +99,14 @@ def _schedule_obs(self, observations):
         """
 
         # Only match if we have completed the second of a pair and are in most recent night.
+        # ugh, stupid np.where doesn't support using scalars anymore
         if np.size(observations) == 1:
-            need_to_observe = (observations["note"] == self.blob_survey.survey_note + ", b") & (
+            if (observations["note"] == self.blob_survey.survey_note + ", b") & (
                 observations["night"] == np.max(observations["night"])
-            )
+            ):
+                need_to_observe = np.array([0])
+            else:
+                need_to_observe = np.array([])
         else:
             need_to_observe = np.where(
                 (observations["note"] == self.blob_survey.survey_note + ", b")