Allow empty query parameters

[IvanBorislavovDimitrov]

Hello,
The cf command-line client supports mapping of empty hosts.
For instance (getting an empty host for domain, one result): /v2/routes?inline-relations-depth=1&q=host%3A%3Bdomain_guid%3A6906bee2-0115-47f6-b7d1-3ef1e455e8e1
"%3A%3B" -> ":;"
The v3 client does not support this feature. Empty parameters are skiped and not set as parameters in the request url.
The following problem occurrs. You have two hosts mapped to domain and application.
When you try to get this empty host all of the hosts for this domain are returned.
Example:
ListSpaceRoutesRequest.Builder requestBuilder = ListSpaceRoutesRequest.builder();
requestBuilder.host(""); -> Ignored in the request (all host are returned)
This pull request removes the checks for empty parameters and allows using empty parametrs.
Could you please review it?
Regards,
Ivan

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