Test empty history condition before.

This allow raise KeyError even for getSerial().

git-svn-id: https://svn.erp5.org/repos/neo/trunk@1802 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/client/app.py

@@ -905,15 +905,16 @@ class Application(object):
 
         if not isinstance(self.local_var.history, tuple):
             raise NEOStorageError('history failed')
-        if object_only:
-            # Use by getSerial
-            return self.local_var.history
 
         if self.local_var.history[1] == []:
             # KeyError expected if no history was found
             # XXX: this may requires an error from the storages
             raise KeyError
 
+        if object_only:
+            # Use by getSerial
+            return self.local_var.history
+
         # Now that we have object informations, get txn informations
         history_list = []
         for serial, size in self.local_var.history[1]: