[17.0][IMP] web_widget_x2many_2d_matrix: fix to prevent errors and update readme usage #3116
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1. Fix the issue reported here #3093 (comment) (1st commit).
Steps to reproduce:
2. Fix the issue where an error is raised when no record exists for a cell (2nd commit).
W/o the fix (2 errors):
With the fix:
3. Update the readme usage cause Odoo renamed some fields.