Fix: Use unwrap_or_else(panic!(...)) as recommended by clippy
Fix: Use unwrap_or_else(panic!(...)) as recommended by clippy

instead of expect()ing errors, clippy suggests to use
unwrap_or_else(|| panic!(...)) - use that instead

Signed-off-by: Matthias Beyer <1d6e1cf70ec6f9ab28d3ea4b27a49a77654d370e@beyermatthias.de>

matthiasbeyer/imag,matthiasbeyer/imag