Fix for rare "Invalid alphabet type" nhmmer error #252
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The following error can arise in edge case inputs:
% nhmmer --dna A.fa B.fa
Error: Invalid alphabet type in target for nhmmer. Expect DNA or RNA.
An example input that will produce this error is:
% cat A.fa
% cat B.fa
Note: it is possible for a user to still sneak past this
test, e.g. with the input:
It has illegal letters for DNA, but is too short for the
guesser to guess. As committed, nhmmer will just breeze
past that sequence with no match. An input with >10 letters
containing any illegal DNA character will produce the
previous message:
% cat A.fa
% cat E.fa
% nhmmer --dna A.fa E.fa
Error: Invalid alphabet type in target for nhmmer. Expect DNA or RNA.