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Panics when saving a new file without specifying a filename

In prompt, if you try to save without passing a file name and there is not yet a file associated to the buffer's content, it panics.

Steps:

  • with 88f55176 and rustc 1.32.0-nightly (9fefb6766 2018-11-13)
  • cargo run --features orbital
  • enter insert mode and write some text
  • enter prompt and execute w 
Starting Sodium
First redraw of the screen
thread 'main' panicked at 'index out of bounds: the len is 0 but the index is 0', /rustc/9fefb67669f00c25b476e7a80c9c9300a987d517/src/libcore/slice/mod.rs:2447:10
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
             at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1: std::sys_common::backtrace::_print
             at libstd/sys_common/backtrace.rs:71
   2: std::panicking::default_hook::{{closure}}
             at libstd/sys_common/backtrace.rs:59
             at libstd/panicking.rs:211
   3: std::panicking::default_hook
             at libstd/panicking.rs:227
   4: std::panicking::rust_panic_with_hook
             at libstd/panicking.rs:476
   5: std::panicking::continue_panic_fmt
             at libstd/panicking.rs:390
   6: rust_begin_unwind
             at libstd/panicking.rs:325
   7: core::panicking::panic_fmt
             at libcore/panicking.rs:77
   8: core::panicking::panic_bounds_check
             at libcore/panicking.rs:59
   9: <usize as core::slice::SliceIndex<[T]>>::index
             at /rustc/9fefb67669f00c25b476e7a80c9c9300a987d517/src/libcore/slice/mod.rs:2447
  10: core::slice::<impl core::ops::index::Index<I> for [T]>::index
             at /rustc/9fefb67669f00c25b476e7a80c9c9300a987d517/src/libcore/slice/mod.rs:2315
  11: <alloc::vec::Vec<T> as core::ops::index::Index<I>>::index
             at /rustc/9fefb67669f00c25b476e7a80c9c9300a987d517/src/liballoc/vec.rs:1653
  12: sodium::io::file::<impl sodium::state::editor::Editor>::write
             at src/io/file.rs:43
  13: sodium::core::prompt::<impl sodium::state::editor::Editor>::invoke
             at src/core/prompt.rs:144
  14: sodium::core::exec::<impl sodium::state::editor::Editor>::exec
             at src/core/exec.rs:279
  15: sodium::state::editor::Editor::init
             at src/state/editor.rs:321
  16: sodium::main
             at src/main.rs:24
  17: std::rt::lang_start::{{closure}}
             at /rustc/9fefb67669f00c25b476e7a80c9c9300a987d517/src/libstd/rt.rs:74
  18: std::panicking::try::do_call
             at libstd/rt.rs:59
             at libstd/panicking.rs:310
  19: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:102
  20: std::rt::lang_start_internal
             at libstd/panicking.rs:289
             at libstd/panic.rs:398
             at libstd/rt.rs:58
  21: std::rt::lang_start
             at /rustc/9fefb67669f00c25b476e7a80c9c9300a987d517/src/libstd/rt.rs:74
  22: main
  23: __libc_start_main
  24: _start