Silence an expected error during testing

THANKS

@@ -7,6 +7,7 @@ Brian Ewins     - Win32 / Portalocker
 Joe Gregorio    - Invoke same version of Python for filters
 Harry Fuecks    - Pipe characters in file names, filter bug
 Eric van der Vlist - Filters to add language, category information
+Chris Dolan     - mkdir cache; default template_dirs; fix xsltproc
 
 This codebase represents a radical refactoring of Planet 2.0, which lists
 the following contributors:

tests/test_idindex.py

@@ -5,6 +5,12 @@ from planet import idindex, config, logger
 
 class idIndexTest(unittest.TestCase):
 
+    def setUp(self):
+        # silence errors
+        import planet
+        planet.logger = None
+        planet.getLogger('CRITICAL',None)
+
     def tearDown(self):
         idindex.destroy()