Fixed super-edge-case bug in debug view where exc_value.args was empty. I…

Fixed super-edge-case bug in debug view where exc_value.args was empty. I managed to trigger this in some template code

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17245 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/views/debug.py

@@ -302,8 +302,14 @@ class ExceptionReporter(object):
         top = max(1, line - context_lines)
         bottom = min(total, line + 1 + context_lines)
 
+        # In some rare cases, exc_value.args might be empty.
+        try:
+            message = self.exc_value.args[0]
+        except IndexError:
+            message = '(Could not get exception message)'
+
         self.template_info = {
-            'message': self.exc_value.args[0],
+            'message': message,
             'source_lines': source_lines[top:bottom],
             'before': before,
             'during': during,