Fix bug when reference slice is on the negative strand and overlapping GenomicAlignBlocks are allowed
Fix bug when reference slice is on the negative strand and overlapping GenomicAlignBlocks are allowed

kumarsaurabh20/ensembl-compara,Ensembl/ensembl-compara,dbolser-ebi/ensembl-compara,ckongEbi/ensembl-compara,dbolser-ebi/ensembl-compara,dbolser-ebi/ensembl-compara,Ensembl/ensembl-compara,etapanari/ensembl-compara,etapanari/ensembl-compara,danstaines/ensembl-compara,danstaines/ensembl-compara,etapanari/ensembl-compara,danstaines/ensembl-compara,Ensembl/ensembl-compara,danstaines/ensembl-compara,ckongEbi/ensembl-compara,danstaines/ensembl-compara,ckongEbi/ensembl-compara,Ensembl/ensembl-compara,etapanari/ensembl-compara,kumarsaurabh20/ensembl-compara,kumarsaurabh20/ensembl-compara,kumarsaurabh20/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara