python lib: from ticket #16, catch OAuthError specifically when fetching the request token in the server. Thanks larlet!

git-svn-id: https://oauth.googlecode.com/svn/code/python@589 f7ae4463-c52f-0410-a7dc-93bad6e629e8

Author: leah.culver

oauth/oauth.py

@@ -285,7 +285,7 @@ def fetch_request_token(self, oauth_request):
         try:
             # get the request token for authorization
             token = self._get_token(oauth_request, 'request')
-        except:
+        except OAuthError:
             # no token required for the initial token request
             version = self._get_version(oauth_request)
             consumer = self._get_consumer(oauth_request)