fix

Signed-off-by: Quentin Remy <quentin.remy@mpi-hd.mpg.de>
SimoneMender · Jul 30, 2024 · 80b931a · 80b931a
1 parent 9662926
commit 80b931a
Showing 1 changed file with 12 additions and 9 deletions.
diff --git a/gammapy/data/observations.py b/gammapy/data/observations.py
@@ -122,14 +122,17 @@ def bkg(self):
         """Background of the observation."""
         bkg = self._bkg
         # used for backward compatibility of old HESS data
-        if (
-            bkg
-            and self._meta
-            and self._meta.optional
-            and self._meta.optional["CREATOR"] == "SASH FITS::EventListWriter"
-            and self.meta.optional["HDUVERS"] == "0.2"
-        ):
-            bkg._fov_alignment = FoVAlignment.REVERSE_LON_RADEC
+        try:
+            if (
+                bkg
+                and self._meta
+                and self._meta.optional
+                and self._meta.optional["CREATOR"] == "SASH FITS::EventListWriter"
+                and self._meta.optional["HDUVERS"] == "0.2"
+            ):
+                bkg._fov_alignment = FoVAlignment.REVERSE_LON_RADEC
+        except KeyError:
+            pass
         return bkg
 
     @bkg.setter
@@ -168,7 +171,7 @@ def rad_max(self):
     def available_hdus(self):
         """Which HDUs are available."""
         available_hdus = []
-        keys = ["_events", "_gti", "aeff", "edisp", "psf", "bkg", "_rad_max"]
+        keys = ["_events", "_gti", "aeff", "edisp", "psf", "_bkg", "_rad_max"]
         hdus = ["events", "gti", "aeff", "edisp", "psf", "bkg", "rad_max"]
         for key, hdu in zip(keys, hdus):
             available = self.__dict__.get(key, False)