If CLARK failed to find reference sequences during a database building, a warning should be shown

If CLARK can't find a database appropriate to the options user set, it tries to build a new database. If the sequences database is supposed to be build from is missing, there are messages in the CLARK output:

The program did not find the database files for the provided settings and reference sequences. The program will build them.
Starting the creation of the database of targets specific 27-mers from input files...
No such file or directory
Failed to open ../../refseq/viral/viral.1.1.genomic.fna.gz
No such file or directory
Failed to open ../../refseq/viral/viral.1.1.genomic.fna.gz
No such file or directory
Failed to open ../../refseq/viral/viral.1.1.genomic.fna.gz
No such file or directory
Failed to open ../../refseq/viral/viral.1.1.genomic.fna.gz
No such file or directory

Parse the output to be able to show warnings about missing original sequences on the dashboard.