CanDoExternalActivities.getExternalActivity() doesn't set external activity attributes

[Douglas Cerna]

From the schooltool.gradebook.interfaces.IExternalActivities interface:

    def getExternalActivity(external_activity_id):
        """Return an IExternalActivity object matching the provided id.

        Return None if it cannot find an appropiate external activity"""

From the schooltool.gradebook.interfaces.IExternalActivity interface:

    source = zope.schema.TextLine(
        title=_(u"External Activity Source"),
        description=_(u"The registration name of the source"),
        required=True)

    external_activity_id = zope.schema.TextLine(
        title=_(u"External Activity ID"),
        description=_(u"A unique identifier for the external activity"),
        required=True)

However, when cando.skilldriver.skilldriver.CanDoExternalActivities.getExternalActivity finds a match for the provided id, it returns a IExternalActivity object with the 'source' and 'external_activity_id' attributes set to ""