Fix AttributeError in close_if_idle() when _http is not initialized #3085
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Fixes #3081
During server shutdown, the _cleanup() function in runners.py calls close_if_idle() on all connection objects. However, if a connection was created but connection_task() hasn't called _setup_connection() yet, the _http attribute doesn't exist, causing an AttributeError.
The HttpProtocolMixin already provides an 'http' property (lines 73-77) that safely handles this case using hasattr(). This commit updates close_if_idle() to use the property instead of direct attribute access.
Changes: