Error getting a specific version when using webroot url

## Gentics Mesh Version.
- v1.7

## Operating System
- Windows

## JVM
- Oracle JDK 11.0.8

## Problem
according to the documentation [versioning](https://getmesh.io/docs/features/#versioning), adding the query parameter version follow by the version number [major].[minor], the specif version should be generated, when I used this format

/api/v2/{project}/nodes/{uuid}?version=[major].[minor]

it works without problems, but if I used this format

/api/v2/{project}/webroot/{slug}?version=[major].[minor]

it shows the next error message

{
"i18nParameters" : [ "{slug}" ],
"i18nKey" : "node_not_found_for_path",
"properties" : { },
"type" : "generic_error",
"message" : "Node for path \{slug}" could not be found."
}

I used the draft and published values in order to check the behavior and both work using the webroot path

Start with the versioning documentation and compare request handling for `/api/v2/{project}/nodes/{uuid}?version=[major].[minor]` and `/api/v2/{project}/webroot/{slug}?version=[major].[minor]`. Reproduce the reported `node_not_found_for_path` response with draft and published values; done when the webroot URL returns the requested version consistently with the node endpoint.

Written by the indexing model from the issue text.