[16.0][FIX] sale_order_report_zero_qty: handle section/note lines

[deeniiz]

Section and note lines (display_type) have no product_uom, so product_uom.rounding evaluates to 0.0 and float_is_zero raises "precision_rounding must be positive". Skip the qty check for these lines so they always render in the report.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.79%. Comparing base (5352fd7) to head (12f28c4).

Additional details and impacted files

@@           Coverage Diff           @@
##             16.0     #899   +/-   ##
=======================================
  Coverage   43.79%   43.79%           
=======================================
  Files         325      325           
  Lines        6464     6464           
  Branches     1011     1011           
=======================================
  Hits         2831     2831           
  Misses       3612     3612           
  Partials       21       21           

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