Skip obscore test when pg_sphere is missing (DM-37939)

The fix only changes type of the exception checked when pg_sphere
extension is installed. The logic which skips the test is already there.

tests/test_obscore.py

@@ -516,9 +516,9 @@ def _handler(cls, postgresql):
         engine = sqlalchemy.engine.create_engine(postgresql.url())
         with engine.begin() as connection:
             try:
-                connection.execute(sqlalchemy.text("CREATE EXTENSION pg_sphere;"))
-            except sqlalchemy.exc.OperationalError:
-                raise unittest.SkipTest("pg_sphere extension does not exist")
+                connection.execute(sqlalchemy.text("CREATE EXTENSION pg_sphere"))
+            except sqlalchemy.exc.DatabaseError as exc:
+                raise unittest.SkipTest(f"pg_sphere extension does not exist: {exc}")
 
     def make_obscore_config(
         self, collections: Optional[List[str]] = None, collection_type: Optional[str] = None