DotNetOpenAuth/DotNetOpenAuth — pull request #261 by AkosLukacs (2013-03-15 16:29:45+00:00)
Title:  A possible fix for exception in ClaimsResponse.Culture, if Language + Country doesn't make a valid culture.

A possible fix for the exception in #260.

Just a simple try-catch. According to this comment at SO http://stackoverflow.com/a/12375100 using try-catch is the fastest is you don't expect a continuous stream of illegal combinations.