fix invalid url bug when importing external models (e.g. from BIOModels)
fix invalid url bug when importing external models (e.g. from BIOModels)

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