Allows header key/value to be empty

[AntoninHuaut]

I have multiple environments and some need a header key with a header value. But my requests collections are the same. To handle it, all my environments have the header key and the header value as variable, but for the environment or is not useful, these values are empty.

There are two problems:

• First, we can't save environments variable with an empty string, it's not persistent
• Second, I can't send request with empty header name: "Error invoking remote method 'send-http-request': Error: header name must be a non-empty string". It is possible to make this check optional or be configurable to be skipped.

Using Bruno v1.11.0

[helloanoop]

Thanks for the PR @AntoninHuaut !

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