Merge pull request ruby-ldap#41 from justcfx2u/master

Fall back if string cannot be encoded

Author: Rory O'Connell

lib/net/ber/core_ext/string.rb

@@ -28,7 +28,11 @@ def raw_utf8_encoded
     if self.respond_to?(:encode)
       # Strings should be UTF-8 encoded according to LDAP.
       # However, the BER code is not necessarily valid UTF-8
-      self.encode('UTF-8').force_encoding('ASCII-8BIT')
+      begin
+        self.encode('UTF-8').force_encoding('ASCII-8BIT')
+      rescue Encoding::UndefinedConversionError
+        self
+      end
     else
       self
     end