fixes #353 - Path not found stopping library scan

MediaBrowser.Server.Implementations/Library/LibraryManager.cs

@@ -536,6 +536,8 @@ namespace MediaBrowser.Server.Implementations.Library
             Parallel.ForEach(files, f =>
             {
                 try
+                {
+                    if (f.Exists)
                     {
                         var item = ResolvePath(f, parent) as T;
 
@@ -547,6 +549,7 @@ namespace MediaBrowser.Server.Implementations.Library
                             }
                         }
                     }
+                }
                 catch (Exception ex)
                 {
                     _logger.ErrorException("Error resolving path {0}", ex, f.FullName);