Client can send messages.

src/authd.cr

@@ -582,7 +582,11 @@ end
 
 class IPC::Client
 	def send(request : AuthD::Request)
-		send @server_fd, request.type.to_u8, request.to_json
+		unless (fd = @server_fd).nil?
+			send fd, request.type.to_u8, request.to_json
+		else
+			raise "Client not connected to the server"
+		end
 	end
 end