tm2z validation ignores an error during profiling [if that error does not have `.code === 'EMAPNIK'`](https://github.com/mapbox/mapbox-upload-validate/blob/4e48fa0ab5d53ca96ac6ec71de6e65c92afafcf6/lib/validators/tm2z.js#L13). Other errors should be passed directly to the callback.
tm2z validation ignores an error during profiling if that error does not have
.code === 'EMAPNIK'. Other errors should be passed directly to the callback.