singularity suffix computed incorrectly

I just tried to do a fresh run and found a different bug. Pegasus is ok with the singularity container being called pycbc-el7:latest, but not pycbc-el7:v1.13.0

2018.11.08 13:01:52.501 EST: [FATAL ERROR]
[1]: Unable to instantiate Transformation Catalog at edu.isi.pegasus.planner.catalog.transformation.TransformationFactory.loadInstance(TransformationFactory.java:172)
[2]: edu.isi.pegasus.planner.catalog.transformation.impl.Text caught edu.isi.pegasus.planner.parser.ScannerException line 1511: at edu.isi.pegasus.planner.parser.TransformationCatalogTextParser.parse(TransformationCatalogTextParser.java:236)
[3]: Invalid suffix .13.0 determined singularity image url url -> file://localhost/cvmfs/singularity.opensciencegrid.org/pycbc/pycbc-el7:v1.13.0 , protocol -> file , host -> localhost , path -> /cvmfs/singularity.opensciencegrid.org/pycbc/pycbc-el7:v1.13.0 , url-prefix -> file://localhost at edu.isi.pegasus.planner.catalog.transformation.classes.Container.computeLFN(Container.java:196)
ERROR while logging metrics The metrics file location is not yet initialized
2018.11.08 13:01:52.504 EST: [DEBUG] Exiting with non-zero exit-code 2
2018.11.08 13:01:52.504 EST: [INFO] event.pegasus.planner planner.version 4.9.1dev (0.557 seconds) - FINISHED