Drops empty .bz2 files when calling sampler to avoid crash
Drops empty .bz2 files when calling sampler to avoid crash

TODO need a more robust way than just filtering based on compressed
file's size (.bz2 > 14 bytes)

HazyResearch/deepdive,HazyResearch/deepdive,HazyResearch/deepdive,HazyResearch/deepdive