`nimble install` fails the first time if package not found in local packages.json
I've noticed this with various packages and on all OSes (mac OS, linux, and windows). If I do `nimble install ansiwave` for example, and it isn't in my local packages.json, it will ask `check internet for updated packages?`. After saying yes, it says it couldn't be found. Then if I run the command again, it installs it correctly.

```
nimble -v
nimble v0.13.1 compiled at 2021-04-15 14:59:18
git hash: couldn't determine git hash
```