UnicodeDecodeError

I'm currently trying to extract files from the ISLE.SI which gives me this error after a while:

```
7c0e000000000100a2926b000000000000000000000000000000000000000000000000000000000000000000989a63000000
4d784f66
Traceback (most recent call last):
File ".\test.py", line 207, in
extract(args.paths, args.output)
File ".\test.py", line 47, in extract
for subchunk in subchunk_iter:
File "D:\Downloads\LegoIslandRip\extract-riff-master\lego_extract\__init__.py", line 63, in subchunks
logger.debug ("{0} {1} {2}".format(subchunk.signature, subchunk.block_size, binascii.hexlify(subchunk.data[:50].encode('utf-8'))))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xa2 in position 8: ordinal not in range(128)
```

Commenting out this line goes to the next instance of binascii.hexlify. Other SI files seem to work.

Reproduce the failure while extracting the reported ISLE.SI file, then inspect lego_extract/__init__.py at line 63 and the logging around subchunk.data. Check why the non-ASCII byte causes the extraction to stop; done means extraction proceeds past this subchunk without the reported UnicodeDecodeError and other SI files still work.

Written by the indexing model from the issue text.