Close connection stability

Author: Francesco Mecatti

server.py

@@ -30,10 +30,12 @@ def handle(self):
 
             if cmd == 'u' or cmd == 'U':
                 filename = protocol_handler.get_input("Filename: ")
+                if not filename;ì: break
                 logging.info(f"Upload request from {self.client_address}. File: {filename}")
                 file_handler.upload(filename)
             elif cmd == 'd' or cmd == 'D':
                 filename = protocol_handler.get_input("Filename: ")
+                if not filename: break
                 logging.info(f"Download request from {self.client_address}. File: {filename}")
                 file_handler.download(filename)
             elif cmd == 'l' or cmd == 'L':