bug: reading edit list packets fails when skipping bytes to the end of the file

[mmalenic]

When decrypting and reading edit list packets, the last edit list skip causes a panic if it goes to the end of the data stream. In this loop:

crypt4gh-rust/src/lib.rs

Lines 516 to 522 in 2d41a17

	loop {
	let n = decrypted.read(SEGMENT_SIZE)?;
	//log::debug!("body_decrypt_parts()'s reading until the end index: {}", n);
	if n == 0 {
	break;
	}
	}

The code tries to read a segment even though there is no data remaining in the read_buffer. This later causes decrypt_block to panic because it gets passed a slice with no data:

crypt4gh-rust/src/lib.rs

Line 577 in 2d41a17

let (nonce_slice, data) = ciphersegment.split_at(12);