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There is an unfortunate signature change with the api.Context NotFound function; whereas the normal modules/context/Context NotFound function requires an error or nil, the api.Context variant will panic with an NPE if a nil is provided. This PR will allow api.Context.NotFound to tolerate a being passed a nil. Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: Lauris BH <lauris@nix.lv>