Skip to content do not clobber existing PERL5LIB

Marek Szuba requested to merge bugfix/env_perl5lib_exists into feature/ensembl_friendly

Created by: mkszuba

As stands, running otter overwrites whatever might have been present in $PERL5LIB. This is a problem e.g. if one uses this variable to make Perl aware of the install directory used by cpanminus. This PR ensures that the original value of PERL5LIB is preserved.

This is related to the otter-client PR Ensembl/otter-client#1.

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