Fix some commands.

util/stats/stats.py:
    we only need the system if we're issuing one of the commands that
    uses a stored formula.

--HG--
extra : convert_revision : d129a00eeba46a03f7d600922d679aa0f43636be

util/stats/stats.py

@@ -132,8 +132,6 @@ def commands(options, command, args):
     info.source.connect()
     info.source.update_dict(globals())
 
-    system = info.source.__dict__[options.system]
-
     if type(options.get) is str:
         info.source.get = options.get
 
@@ -232,6 +230,8 @@ def commands(options, command, args):
     if len(args):
         raise CommandException
 
+    system = info.source.__dict__[options.system]
+
     if command == 'usertime':
         import copy
         kernel = copy.copy(system.full_cpu.numCycles)