Make check for empty trusted proxies more strict

[kesselb]

Follow-Up #14261

[MorrisJobke]

Rebased to check if there are any CI failures.

[MorrisJobke]

@kesselb What is the status here?

[kesselb]

Looks good to me 🤣 $trustedProxies is always an array so this check would be more precise.

[MorrisJobke]

Code makes sense 👍

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 17189: failure

TESTS=acceptance, TESTS-ACCEPTANCE=apps

• tests/acceptance/features/apps.feature:43

Show full log

 Scenario: Enable an app bundle # /drone/src/github.com/nextcloud/server/tests/acceptance/features/apps.feature:43
Given I act as Jane # ActorContext::iActAs()
And I am logged in as the admin # LoginPageContext::iAmLoggedInAsTheAdmin()
And I open the Apps management # SettingsMenuContext::iOpenTheAppsManagement()
And I open the "App bundles" section # AppNavigationContext::iOpenTheSection()
When I enable all apps from the "Enterprise bundle" # AppsManagementContext::iEnableAllAppsFromThe()
Then I see that the "Auditing / Logging" app has been enabled # AppsManagementContext::iSeeThatTheAppHasBeenEnabled()
Disable button in the app list for Auditing / Logging could not be found after 100 seconds (NoSuchElementException)
And I see that the "LDAP user and group backend" app has been enabled # AppsManagementContext::iSeeThatTheAppHasBeenEnabled()

[MorrisJobke]

• tests/acceptance/features/apps.feature:43

"Fixed" with #14774 (caused by #14578)