apache / apache/beam

Python direct runner doesn't emit empty pane when it should

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bug direct P2 python runners
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Description

In test_stream_test.py, the test test_gbk_execution_no_triggers there is positive allowed_lateness. So the two windows [15, 30) and [300, 315) that do not have late data should have an empty pane emitted when window finishes (after allowed lateness) since the default ClosingBehavior in Python is EMIT_ALWAYS (see transforms/core.py).

Imported from Jira [BEAM-9293](https://issues.apache.org/jira/browse/BEAM-9293). Original Jira may contain additional context.
Reported by: crites.

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