Crash on enter and missing history

[jrfondren]

Replication:

1. rm ~/.local/share/data/history.json
2. start beacon
3. hit enter

thread 'main' panicked at src/main.rs:333:60:
no entry found for key
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

At

Message::RunInput => {
    let inp: String = state.input_value[&focused_pane].clone();

I encountered this behavior on the first run.

This unbranded pathname can also conflict with other software.