bitbake: tinfoil: Do not fail when logging is disabled and full config is used

If Tinfoil is initialized with setup_logging = False and
Tinfoil.prepare() is called with config_only = False, then it fails
because self.localhandlers is only initialized when
setup_logging = True.

This is seen with, e.g., `bitbake-getvar -q -r busybox MACHINE`:

  Traceback (most recent call last):
    File ".../bitbake/bin/bitbake-getvar", line 41, in <module>
      tinfoil.prepare(quiet=2)
    File ".../bitbake/lib/bb/tinfoil.py", line 390, in prepare
      for handler in self.localhandlers:
  AttributeError: 'Tinfoil' object has no attribute 'localhandlers'.
  Did you mean: 'oldhandlers'?

(Bitbake rev: e452c6d7ba5bb4f78a1d2bfb742794efdf171dbc)

Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 616101ddb630e2c9975022068b52a87c4cf647f6)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

bitbake/lib/bb/tinfoil.py

@@ -324,11 +324,11 @@ class Tinfoil:
         self.recipes_parsed = False
         self.quiet = 0
         self.oldhandlers = self.logger.handlers[:]
+        self.localhandlers = []
         if setup_logging:
             # This is the *client-side* logger, nothing to do with
             # logging messages from the server
             bb.msg.logger_create('BitBake', output)
-            self.localhandlers = []
             for handler in self.logger.handlers:
                 if handler not in self.oldhandlers:
                     self.localhandlers.append(handler)