Trivial: Do not prepend class name if instance of Warning

git-svn-id: https://svn.code.sf.net/p/dispcalgui/code/trunk@4696 6ae35eb0-b8ff-4ca7-919d-0ec1eff389cd

DisplayCAL/util_str.py

@@ -457,7 +457,7 @@ def safe_basestring(obj):
 				obj = str(obj)
 			except UnicodeEncodeError:
 				obj = repr(obj)
-	if isinstance(oobj, Exception):
+	if isinstance(oobj, Exception) and not isinstance(oobj, Warning):
 		if obj and oobj.__class__.__name__ in dir(exceptions):
 			obj = obj[0].capitalize() + obj[1:]
 		module = getattr(oobj, "__module__", "")