fixed  the bug when some align slice  contigs did not get displayed
fixed  the bug when some align slice  contigs did not get displayed

Ensembl/ensembl-draw,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode