MakoMiddleware::__init__() creates temporary directories even when one is provided in settings

[tuxdna]

Copied from: http://code.google.com/p/django-mako/issues/detail?id=3

What steps will reproduce the problem?

1. remove all the temporary folders created by tempfile.mkdtemp(): rm -rf
   /tmp/tmp*
2. now open a python shell and enter the following lines. note that same
   concept is used in middleware.py too:

import tempfile
settings = 'a string'

fetch the value of attribute 'upper' of instance 'settings',

since a string always has 'upper' attribute( a method ),

it will be returned. but still a temporary directory will be created

meth = getattr(settings,'upper',tempfile.mkdtemp())

1. a temporary directory will be created, check it like:
   ls -ld /tmp/tmp*

What is the expected output? What do you see instead?

• If the settings file already contains a 'MAKO_MODULE_DIR', no temporary
  directories should be created.

What version of the product are you using? On what operating system?

• SVN trunk, on Fedora 12

Please provide any additional information below.

• Attached patch fixes the issue. Please apply it to SVN trunk.