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# Copyright 2009 Canonical Ltd. This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).
__metaclass__ = type
__all__ = [
'at_least_one_task',
]
from lp.bugs.interfaces.bug import CreatedBugWithNoBugTasksError
def at_least_one_task(bug, event):
"""Make sure that the created bug has at least one task.
CreatedBugWithNoBugTasksError is raised it if the bug has no tasks.
"""
if len(bug.bugtasks) == 0:
raise CreatedBugWithNoBugTasksError(
"The bug has to affect at least one product or distribution.")
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