Added detection if this is a git based install or not. (#9379)

Not sure about the warning or text.

DO NOT DELETE THIS TEXT

#### Please note

> Please read this information carefully. You can run `./scripts/pre-commit.php` to check your code before submitting.

- [x] Have you followed our [code guidelines?](http://docs.librenms.org/Developing/Code-Guidelines/)

#### Testers

If you would like to test this pull request then please run: `./scripts/github-apply <pr_id>`, i.e `./scripts/github-apply 5926`
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LibreNMS/Validations/User.php

@@ -59,6 +59,10 @@ class User extends BaseValidation
             }
         }
 
+        # if no git, then we probably have different permissions by design
+        if (!is_git_install()) {
+            return;
+        }
 
         // Let's test the user configured if we have it
         if (Config::has('user')) {