fix: Avoid throwing errors for teams are unavailable

Signed-off-by: Julius Härtl <jus@bitgrid.net>

lib/private/Teams/TeamManager.php

@@ -52,6 +52,10 @@ public function hasTeamSupport(): bool {
 	}
 
 	public function getProviders(): array {
+		if (!$this->hasTeamSupport()) {
+			return [];
+		}
+
 		if ($this->providers !== null) {
 			return $this->providers;
 		}
@@ -78,6 +82,10 @@ public function getProvider(string $providerId): ITeamResourceProvider {
 	}
 
 	public function getSharedWith(string $teamId, string $userId): array {
+		if (!$this->hasTeamSupport()) {
+			return [];
+		}
+
 		if ($this->getTeam($teamId, $userId) === null) {
 			return [];
 		}
@@ -92,6 +100,10 @@ public function getSharedWith(string $teamId, string $userId): array {
 	}
 
 	public function getTeamsForResource(string $providerId, string $resourceId, string $userId): array {
+		if (!$this->hasTeamSupport()) {
+			return [];
+		}
+
 		$provider = $this->getProvider($providerId);
 		return array_values(array_filter(array_map(function ($teamId) use ($userId) {
 			$team = $this->getTeam($teamId, $userId);
@@ -108,6 +120,10 @@ public function getTeamsForResource(string $providerId, string $resourceId, stri
 	}
 
 	private function getTeam(string $teamId, string $userId): ?Circle {
+		if (!$this->hasTeamSupport()) {
+			return null;
+		}
+
 		try {
 			$federatedUser = $this->circlesManager->getFederatedUser($userId, Member::TYPE_USER);
 			$this->circlesManager->startSession($federatedUser);