fix to silly mistake in content_stats
fix to silly mistake in content_stats

was usign the string rather than class the create and instance

Virtual-Liver-Network/seek,HITS-SDBV/seek,SynthSys/seek,SynthSys/seek,aina1205/nmtrypi-seek,HITS-SDBV/seek,stuzart/seek,HITS-SDBV/nmtrypi-seek,aina1205/nmtrypi-seek,HITS-SDBV/nmtrypi-seek,Virtual-Liver-Network/seek,stuzart/seek,kjgarza/frame_experiment,HITS-SDBV/seek,Virtual-Liver-Network/seek,kjgarza/frame_experiment,kjgarza/frame_experiment,aina1205/nmtrypi-seek,SynthSys/seek,aina1205/nmtrypi-seek,HITS-SDBV/seek,stuzart/seek,HITS-SDBV/nmtrypi-seek,Virtual-Liver-Network/seek,HITS-SDBV/nmtrypi-seek,kjgarza/frame_experiment,SynthSys/seek