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panic when run without subcommand in most obvious way

Without any config file. Repro'd with ef374c92. Reported by @beth.

zealot:arti> nailing-cargo run --bin arti
nailing-cargo: out-of-tree, git, building in: `/home/ian/Rustup/Arti/Build/arti'
nailing-cargo: using really to run as user `rustcargo'
nailing-cargo: *WARNING* cwd is not in Cargo.nail thbough it has Cargo.toml!
nailing-cargo: nailed (2 manifests, 2 packages)
nailing-cargo: invoking: cargo run --locked --offline --bin arti
    Finished dev [unoptimized + debuginfo] target(s) in 0.48s
     Running `target/debug/arti`
thread 'main' panicked at crates/arti/src/lib.rs:602:9:
Subcommand added to clap subcommand list, but not yet implemented
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
2024-03-04T16:03:02Z ERROR arti::logging: Panic at crates/arti/src/lib.rs:602:9: Subcommand added to clap subcommand list, but not yet implemented
   0: arti::logging::install_panic_handler::{{closure}}
             at crates/arti/src/logging.rs:286:25
   1: <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/alloc/src/boxed.rs:2029:9
      std::panicking::rust_panic_with_hook
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/std/src/panicking.rs:785:13
   2: std::panicking::begin_panic_handler::{{closure}}
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/std/src/panicking.rs:651:13
   3: std::sys_common::backtrace::__rust_end_short_backtrace
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/std/src/sys_common/backtrace.rs:171:18
   4: rust_begin_unwind
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/std/src/panicking.rs:647:5
   5: core::panicking::panic_fmt
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/core/src/panicking.rs:72:14
   6: arti::main_main
             at crates/arti/src/lib.rs:602:9
   7: arti::main
             at crates/arti/src/lib.rs:632:11
   8: arti::main
             at crates/arti/src/main.rs:46:5
   9: core::ops::function::FnOnce::call_once
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/core/src/ops/function.rs:250:5
  10: std::sys_common::backtrace::__rust_begin_short_backtrace
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/std/src/sys_common/backtrace.rs:155:18
  11: std::rt::lang_start::{{closure}}
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/std/src/rt.rs:166:18
  12: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/core/src/ops/function.rs:284:13
      std::panicking::try::do_call
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/std/src/panicking.rs:554:40
      std::panicking::try
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/std/src/panicking.rs:518:19
      std::panic::catch_unwind
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/std/src/panic.rs:142:14
      std::rt::lang_start_internal::{{closure}}
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/std/src/rt.rs:148:48
      std::panicking::try::do_call
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/std/src/panicking.rs:554:40
      std::panicking::try
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/std/src/panicking.rs:518:19
      std::panic::catch_unwind
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/std/src/panic.rs:142:14
      std::rt::lang_start_internal
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/std/src/rt.rs:148:20
  13: std::rt::lang_start
             at /rustc/f2043422f7b161a2fc1a00589a8c4956db963450/library/std/src/rt.rs:165:17
  14: main
  15: __libc_start_main
             at /build/glibc-6iIyft/glibc-2.28/csu/../csu/libc-start.c:308:16
  16: _start

nailing-cargo: really failed (exit status 25856)
nailing-cargo: unnailed.  status 101.
zealot:arti>