Wrap getpreferredencoding()'s use of setlocale in a try/except to prevent

us from raising an exception when the locale is invalid.

Issue #1443504

Lib/locale.py

@@ -553,7 +553,10 @@ else:
             according to the system configuration."""
             if do_setlocale:
                 oldloc = setlocale(LC_CTYPE)
-                setlocale(LC_CTYPE, "")
+                try:
+                    setlocale(LC_CTYPE, "")
+                except:
+                    pass
                 result = nl_langinfo(CODESET)
                 setlocale(LC_CTYPE, oldloc)
                 return result