Small fixes:
- Version 0.0.1 created a TSV file called "blah.tsv". This was a carry-over from trouble-shooting that I forgot to remove! It is no longer created.
- In cases where flu contigs were created, but all of them had insufficient positions with ATGC and minimum depth of cov ("sequenced bases") to achieve minimum segment coverage, an empty consensus_seqs.fa file was created. This led to an empty input file error message when it was opened later to count sequenced bases for the report. There is now a check before writing the consensus sequences after low coverage positions are masked to make sure the file would not be empty.