Charles/fix download bugs (#491)
Charles/fix download bugs (#491)

* fix filename

* handle non-existent pipeline_run

* unique names

* fix bug

chanzuckerberg/idseq-web,chanzuckerberg/idseq-web,chanzuckerberg/idseq-web,chanzuckerberg/idseq-web,chanzuckerberg/idseq-web