CLI: remove timeout for offline commands

e.g. when interacting with hw wallets (e.g. signmessage)
it does not make sense to time out

also, str(e) of some exceptions such as TimeoutError is ""...

run_electrum

@@ -395,7 +395,7 @@ if __name__ == '__main__':
                     print_msg("To run this command without a daemon, use --offline")
                 sys_exit(1)
             except Exception as e:
-                print_stderr(e)
+                print_stderr(str(e) or repr(e))
                 sys_exit(1)
         else:
             if cmd.requires_network:
@@ -406,9 +406,9 @@ if __name__ == '__main__':
             coro = run_offline_command(config, config_options, plugins)
             fut = asyncio.run_coroutine_threadsafe(coro, loop)
             try:
-                result = fut.result(10)
+                result = fut.result()
             except Exception as e:
-                print_stderr(e)
+                print_stderr(str(e) or repr(e))
                 sys_exit(1)
     if isinstance(result, str):
         print_msg(result)