--print-token crashes if MOZ_TOKEN set

[abhillman]

Repro:

1. $ export MOZ_TOKEN=...
2. $ mozwire --print-token
3. 💥

]$ RUST_BACKTRACE=full mozwire --print-token
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: reqwest::Error { kind: Builder, source: http::Error(InvalidHeaderValue) }', src/main.rs:178:18
stack backtrace:
   0:     0x561512e8897c - <unknown>
   1:     0x561512cdaefe - <unknown>
   2:     0x561512e9d644 - <unknown>
   3:     0x561512e8874f - <unknown>
   4:     0x561512e9da1f - <unknown>
   5:     0x561512e9e651 - <unknown>
   6:     0x561512e88db4 - <unknown>
   7:     0x561512e88d16 - <unknown>
   8:     0x561512e9def1 - <unknown>
   9:     0x561512c3dee2 - <unknown>
  10:     0x561512c3e372 - <unknown>
  11:     0x561512c6c9cc - <unknown>
  12:     0x561512c4b083 - <unknown>
  13:     0x561512c7cb7a - <unknown>
  14:     0x7fe092170ace - __libc_start_call_main
  15:     0x7fe092170b89 - __libc_start_main@@GLIBC_2.34
  16:     0x561512c49795 - <unknown>
  17:                0x0 - <unknown>

Expected behavior:

I'm not sure. Perhaps an error that says that MOZ_TOKEN is currently set. Alternatively, a warning message with the typical behavior of mozwire --print-token (i.e. opening a browser).

[NilsIrl]

Would it be possible try with a debug build?