[FIX] http_routing: raise NotFound when ModelConverter don't match
[FIX] http_routing: raise NotFound when ModelConverter don't match

Before this commit, if you call a route with an missing ID, you
see an internal error 500 "Record not existing" (MissingError)

It has been intriduced by commit 9dc173cc2e13eb6cd3a8845178c2d3fa95a9cadf

Now we catch the missing Error and return explicitely a 404 exception.

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