script_dir computation line error handling is incorrect

[grumpyf0x48]

When using argbash with parsing code generated in a separate script, the following code is generated:

script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)" || die "Couldn't determine the script's running directory, which probably matters, bailing out" 2
. "$script_dir/simple-parsing.sh"  # '.' means 'source'

So if the script_dir computation fails, the call to die will fail because this function is defined in $script_dir/simple-parsing.sh which inclusion just failed !

Normaly it will never happen since dirname and pwd probably won't fail but it would be better to do:

|| { echo "Couldn't determine the script's running directory, which probably matters, bailing out"; exit 2; }