bugfix/asdf-handler (#1012)

* try/except asdf setval to isolate errors

* comment out getval and setval methods entirely

* uncomment asdf methods, fix get_observatory call

* update changelog

* fix pr number

CHANGES.rst

@@ -1,3 +1,12 @@
+11.17.9 (unreleased)
+====================
+
+General
+-------
+
+- bugfix: get observatory metadata inside asdf file handler [#1012]
+
+
 11.17.8 (2023-11-07)
 ====================
 

crds/io/factory.py

@@ -75,13 +75,12 @@ def get_observatory(filepath, original_name=None):
         except KeyError:
             pass
     elif original_name.endswith(".asdf"):
-        try:
-            import asdf
-            with asdf.open(filepath) as handle:
-                observatory = handle["meta"]["telescope"]
-        except KeyError:
+        import asdf
+        with asdf.open(filepath) as handle:
             if "roman" in handle.keys():
                 observatory = "roman"
+            else:
+                observatory = handle["meta"]["telescope"]
     elif original_name.endswith((".yaml", ".json", ".text", ".txt")):
         return "jwst"
     return observatory.lower()