Refactor getFile. Now returns an empty string for not existent file

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk/utils@41115 20353a03-c40f-0410-a6d1-a30d3c3de9de

cloudooo/document.py

@@ -163,8 +163,8 @@ class OdfDocument(object):
     return self._zipfile.read('content.xml')
 
   def getFile(self, path):
-    """If exists, returns file as string, else return None"""
+    """If exists, returns file as string, else return an empty string"""
     try:
       return self._zipfile.read(path)
     except KeyError:
-      return None
+      return ''

cloudooo/tests/testOdfDocument.py

@@ -55,7 +55,7 @@ class TestOdfDocument(cloudoooTestCase):
   def testGetNotPresentFile(self):
     """Test if the getFile method returns None for not present file request"""
     requested_file = self.oodocument.getFile('not_present.xml')
-    self.assertEquals(requested_file, None)
+    self.assertEquals(requested_file, '')
 
   def testParseContent(self):
     """Test if the _parsed_content attribute is the parsed content.xml"""