Lost of data with dada2

[jairideout (Jai Ram Rideout)]

@benjjneb

An aside, we/I should update the q2-dada2 plugin to report the fraction of reads making it through each step. That would make it easier to diagnose where issues like this arise within the multi-step pipeline the plugin implements.

that'd be great! Linking to the issue for tracking purposes, we'll follow up here when it's available in a qiime2 release!