fix(server): resMan init race

[tens0rfl0w]

Goal of this PR

This code path is affected by a potential race condition during server initialization, as commands may be executed before the resource context is fully initialized.

How is this PR achieving the goal

Early-out if we are not initialized, as there is no res cache to target yet.

This PR applies to the following area(s)

Server

Successfully tested on

Game builds: Not applicable

Platforms: Windows (Server)

Checklist

• Code compiles and has been tested successfully.
• Code explains itself well and/or is documented.
• My commit message explains what the changes do and what they are for.
• No extra compilation warnings are added by these changes.

Fixes issues

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