Unhandled error: output not found

[damiclem]

The file alignment_utils.py contains the find_target(...) function. The function takes as input a .tsv file which was previously produced, loads it in memory using Pandas and parses it to produce actual output file.

However, in case no hit is found beforehand, such .tsv file to parse won't be found. This error must be handled>: in case file does not exists, then show a WARNING in stdout, instead an ERROR in stderr, This makes debug easier.