Use require/assert.Empty instead of require/assert.Len(t, X, 0) (#13413)

app/user_test.go

@@ -833,7 +833,7 @@ func TestGetViewUsersRestrictions(t *testing.T) {
 		require.Nil(t, err)
 
 		assert.NotNil(t, restrictions)
-		assert.Len(t, restrictions.Teams, 0)
+		assert.Empty(t, restrictions.Teams)
 		assert.NotNil(t, restrictions.Channels)
 		assert.ElementsMatch(t, []string{team1townsquare.Id, team1offtopic.Id, team1channel1.Id, team1channel2.Id, team2townsquare.Id, team2offtopic.Id, team2channel1.Id}, restrictions.Channels)
 	})