Collapse children without parent
I found this in the JS console: ``` Uncaught TypeError: e.parentNode is null collapse_children https://erp-prod.jurassicfruit.net/dist/tryton-sao.min.js:4 collapse_row https://erp-prod.jurassicfruit.net/dist/tryton-sao.min.js:4 toggle_row https://erp-prod.jurassicfruit.net/dist/tryton-sao.min.js:4 e https://erp-prod.jurassicfruit.net/dist/tryton-sao.min.js:4 jQuery 2 ``` I do not know how to reproduce but `toggle_row` is called by keypress or click as callback so it could happen when the row was already removed from the parent. So it will be safer to not always expect a parent node.
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