Accept empty `.env` keys

[bilogic]

$ infisical secrets set --file .env --env=staging
Secret key 'AWS_ACCESS_KEY_ID' has an empty value

Problem

A message like this is vague... is it a warning, info or error?

What actually happened

It did not try to set any key in the whole .env

What should happen

1. The output should indicate how many keys were set
2. It should also allow empty keys in .env and just set value as empty since the UI allows empty values