def get_content(self):
        if self.isdir:
            return None
        return FileContentStream(self)
ModuleError should be passed the module instance that signaled the
dataset/ETHPy150Open edgewall/trac/tracopt/versioncontrol/svn/svn_fs.py/SubversionNode.get_content--crossover with--dataset/ETHPy150Open VisTrails/VisTrails/vistrails/core/modules/vistrails_module.py/ModuleError.__init__