[Legacy XML Playlist] Fix import if queue missing

If there is somehow a legacy XML playlist, and there is no queue entry
in the plist, then it should not throw an exception from trying to add
a nil object to the return dictionary.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>

Playlist/XmlContainer.m

@@ -95,6 +95,7 @@
 		items = dict[@"items"];
 		albumArt = dict[@"albumArt"];
 		queueList = dict[@"queue"];
+		if(!queueList) queueList = @[];
 	}
 
 	NSMutableArray *entries = [NSMutableArray array];