[MDL-34774] Incorrect lesson statitics when there is only one attempt with score of 0 - Moodle Tracker

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Affected Branches:
MOODLE_23_STABLE, MOODLE_24_STABLE, MOODLE_25_STABLE
Fixed Branches:
MOODLE_23_STABLE, MOODLE_24_STABLE
Pull from Repository:
git://github.com/rwijaya/moodle.git
Pull Master Branch:
~~MDL-34774~~
Pull Master Diff URL:
https://github.com/rwijaya/moodle/compare/moodle:master...MDL-34774
Testing Instructions:
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Create a lesson with a question

Attempt the lesson as student and secure 0 grade

View the report for the lesson as teacher

Make sure the lesson statistics 'high score' and 'low score' columns value is displaying 0%.
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Create a lesson with a question Attempt the lesson as student and secure 0 grade View the report for the lesson as teacher Make sure the lesson statistics 'high score' and 'low score' columns value is displaying 0%.

When there is only one attempt in a lesson with 0 score. The "high score" and "low score" column show "Not completed%".

Replication steps:-

has a non-specific relationship to

MDL-38429 Improve lesson statistics code

Testing discovered

MDL-34259 Lesson breaks when user does not select an answer

Participants:: Adrian Greeve, Andrew Davis, Ankit Agarwal, Eloy Lafuente (stronk7), Rossiani Wijaya

Component watchers:: Ilya Tregubov, Kevin Percy, Mathew May, Mihail Geshoski, Shamim Rezaie