UnicodeError with its traceback should be logged while rendering genshi template

[Jun Omae]

If an UnicodeError raises while rendering genshi template, traceback of the error will not be logged. The behavior makes increasingly difficult to solve, especially if rendering unknown template location.

I think we should log the error with its traceback in this case.

trac/web/chrome.py

@@ -885 +885 @@
             req.chrome['script_data'] = script_data
             # give some hints when hitting a Genshi unicode error
             if isinstance(e, UnicodeError):
+                self.log.error('Exception caught while rendering %s%s',
+                               filename,
+                               exception_to_unicode(e, traceback=True))
                 pos = self._stream_location(stream)
                 if pos:
                     location = "'%s', line %s, char %s" % pos