Shorter exception message, not everything is installed from PyPI

diff --git a/pyderasn.py b/pyderasn.py
index d50415b962d078bab5ce192910bc86664d454127..7178d8104bd7bc5316380e22fd89728fdd495603 100755 (executable)
--- a/pyderasn.py
+++ b/pyderasn.py
@@ -5251,9 +5251,7 @@ class UTCTime(VisibleString):
         try:
             return self._value.replace(tzinfo=tzUTC)
         except TypeError as err:
-            raise NotImplementedError(
-                "Package python-dateutil is required to use this feature",
-            ) from err
+            raise NotImplementedError("Missing dateutil.tz") from err
 
     def __repr__(self):
         return pp_console_row(next(self.pps()))