Break infinite loop when the whole CDR3 sequence is identical to the germline reference.
Break infinite loop when the whole CDR3 sequence is identical to the germline reference.

Closes: Clonotype_that_takes_ages_for_calculating_the_Yassai_identifier.

charles-plessy/clonotypeR,charles-plessy/clonotypeR,charles-plessy/clonotypeR