catch unicode error listing profiles

there can be garbage files on the filesystem, and we shouldn't be bothered by them.

IPython/core/profileapp.py

@@ -99,7 +99,10 b' def list_profiles_in(path):'
     files = os.listdir(path)
     profiles = []
     for f in files:
-        full_path = os.path.join(path, f)
+        try:
+            full_path = os.path.join(path, f)
+        except UnicodeError:
+            continue
         if os.path.isdir(full_path) and f.startswith('profile_'):
             profiles.append(f.split('_',1)[-1])
     return profiles