grin-wallet crashes when attempting to send amount larger than balance

[nthrow]

Describe the bug
When attempting to send an amount larger than the wallet's current balance, grin-wallet will panick and exit ungracefully.

To Reproduce

Password:
20210126 18:08:18.953 WARN grin_wallet_libwallet::api_impl::owner_updater - Scanning - 0% complete
20210126 18:08:19.183 WARN grin_wallet_libwallet::api_impl::owner_updater - Scanning - 99% complete
20210126 18:08:19.198 WARN grin_wallet_libwallet::api_impl::owner_updater - Scanning - 99% complete
20210126 18:08:19.199 WARN grin_wallet_libwallet::api_impl::owner_updater - Scanning Complete

____ Wallet Summary Info - Account 'default' as of height 1063713 ____

 Confirmed Total                  | 220.059956334
 Awaiting Confirmation (< 10)     | 0.000000000
 Awaiting Finalization            | 0.000000000
 Locked by previous transaction   | 0.000000000
 -------------------------------- | -------------
 Currently Spendable              | 220.059956334

Command 'info' completed successfully
nthrow@debian:~$ grin-wallet send -e -m 220
Password:

Estimation for sending 220.000000000:

+--------------------+-------------+----------------+
| Selection strategy | Fee         | Will be locked |
+====================+=============+================+
| smallest           | 0.023000000 | 220.059956334  |
+--------------------+-------------+----------------+
| all                | 0.023000000 | 220.059956334  |
+--------------------+-------------+----------------+

Command 'send' completed successfully
nthrow@debian:~$ grin-wallet send -e -m 220.5                                                                                                                                                                                                                                                                                                                                                           
Password:
20210126 18:08:33.539 ERROR grin_util::logger -
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error { inner:

Not enough funds. Required: 220.512500000, Available: 220.059956334 }': /home/vsts/work/1/s/controller/src/command.rs:294   0: grin_util::logger::send_panic_to_log::{{closure}}
   1: std::panicking::rust_panic_with_hook
             at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panicking.rs:597
   2: std::panicking::begin_panic_handler::{{closure}}
             at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panicking.rs:499
   3: std::sys_common::backtrace::__rust_end_short_backtrace
             at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/sys_common/backtrace.rs:141
   4: rust_begin_unwind
             at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panicking.rs:495
   5: core::panicking::panic_fmt
             at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/core/src/panicking.rs:92
   6: core::option::expect_none_failed
             at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/core/src/option.rs:1268
   7: grin_wallet_controller::command::send::{{closure}}::{{closure}}
   8: <core::iter::adapters::Map<I,F> as core::iter::traits::iterator::Iterator>::fold
   9: grin_wallet_controller::command::send::{{closure}}
  10: grin_wallet_controller::controller::owner_single_use
  11: grin_wallet_controller::command::send
  12: grin_wallet::cmd::wallet_args::parse_and_execute
  13: grin_wallet::cmd::wallet_args::wallet_command
  14: grin_wallet::cmd::wallet::wallet_command
  15: grin_wallet::real_main
  16: grin_wallet::main
  17: std::sys_common::backtrace::__rust_begin_short_backtrace
  18: std::rt::lang_start::{{closure}}
  19: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once
             at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/core/src/ops/function.rs:259
      std::panicking::try::do_call
             at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panicking.rs:381
      std::panicking::try
             at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panicking.rs:345
      std::panic::catch_unwind
             at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panic.rs:396
      std::rt::lang_start_internal
             at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/rt.rs:51
  20: main
  21: __libc_start_main
  22: _start



Thread 'main' panicked with message:
"called `Result::unwrap()` on an `Err` value: Error { inner:

Not enough funds. Required: 220.512500000, Available: 220.059956334 }"
See /home/nthrow/.grin/main/grin-wallet.log for further details.

Expected behavior
A graceful response, such as a message saying "Not enough funds!" or whatever. Also, the ability to "send all" or "send max" with auto-calculation of fees would be amazing, as I found this bug in trying to do as much manually.

Desktop (please complete the following information):

PRETTY_NAME="Debian GNU/Linux 10 (buster)"
NAME="Debian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

[jaspervdm]

I agree, it would be nicer to have a clean error message instead of a panic. Thanks for reporting