fix error synchronizing collections from plex server that has zero collections (#1964)

CHANGELOG.md

@@ -4,6 +4,8 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
+### Fixed
+- Fix error message about synchronizing Plex collections from a Plex server that has zero collections
 
 ## [25.1.0] - 2025-01-10
 ### Added

ErsatzTV.Infrastructure/Plex/PlexServerApiClient.cs

@@ -348,6 +348,10 @@ public class PlexServerApiClient : IPlexServerApiClient
         IPlexServerApi xmlService = XmlServiceFor(connection.Uri);
 
         int size = await countItems(xmlService).Map(r => r.TotalSize);
+        if (size == 0)
+        {
+            yield break;
+        }
 
         const int PAGE_SIZE = 10;