Cast string grading policy counts to int for progress API

[Chessing234]

Bug

Courses with string-typed min_count or drop_count values in the grading policy crash the learner progress page with TypeError: can't multiply sequence by non-int of type 'str' (#38631).

Root cause

_build_policy_map passes drop_count and min_count through unchanged. When those values are strings (e.g. "2.0"), _AssignmentBucket.with_placeholders executes [0] * num_total with a string multiplier.

Why this fix is correct

Cast both fields with int(float(...)), which accepts numeric strings and integers already stored in policy JSON, ensuring num_total and num_droppable are always integers before bucket math.

Fixes #38631

Made with Cursor

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