In the call to Chart.js we pass a ctx which should be a DOM element,
however we pass `null` as the ctx.
It seems that what happens is that we look for the DOM element inside
the `document` (via getElementById) but this element is not yet inserted
into the document, hence this returns `null`.
Since we already have a reference to the canvas element which should be
used as ctx, we can probably just reuse this reference
closesodoo/odoo#36072
Signed-off-by: Adrien Dieudonné (adr) <adr@odoo.com>
RomainLibert
6aaef4a3d9