fix: cannot access local variable 'ssh' where it is not associated wi…

…th a value

main.py

@@ -143,7 +143,7 @@ def create_zipFile(hostname, port, username, password, var_files, opt_files, is_
 
     except Exception as e:
         logging.info(e)
-        if hasattr(ssh, "close"):
+        if ssh and hasattr(ssh, "close"):
             ssh.close()
         return
     ssh.close()