[Push] Suggest other command if dp.json is missing

[zelima]

data push will fail if dp.json is missing with following error

ENOENT: no such file or directory, open '/.../datapackage.json'

How to reproduce

• run data push in directory without datapackage.json

Expected behavior

Should suggest help or init

datapackage.json is missing

Type data init to create datapackage.json
Type data help push  for more info

[AcckiyGerman]

fixed: frictionlessdata/frictionless-js#29 waiting for a review

[AcckiyGerman]

fix moved from data.js to data-cli to keep the data.js clean for using in non-datahub context.
Waiting for a review...

[AcckiyGerman]

FIXED: datopian/data-cli#275

$ data push
Error: No datapackage.json at destination.
> Run 'data init' to create a datapackage.
> Run 'data help push' for more info.