Environment
Provide version numbers for the following components (information can be retrieved by runningtns info in your project folder or by inspecting thepackage.json of the project):

• CLI: 6.3.3
• Cross-platform modules: 6.3.0
• Android Runtime: 6.3.0

Describe the bug
We are not able to cloud run with snapshot when the Android platform is not added.

To Reproduce

1. navigate to any nativescript application (e.g. an empty js app)
2. rm -rf platforms
3. install the nativescript-cloud extension
4. tns login
5. tns cloud run android --release --key-store.... --env.snapshot
6. "enoent" exception will be thrown.

Expected behavior
The platforms folder should be automatically setup.