add node about empty content filter
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@ -61,6 +61,8 @@ which is used to filter by resource type like stream or playlist, and
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[SortFilter](https://teamnewpipe.github.io/NewPipeExtractor/javadoc/org/schabi/newpipe/extractor/linkhandler/ListLinkHandler.html#sortFilter)
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which is used to sort by name, date or view count.
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__!!ATENTION!!__ Be careful when you implement content filter: No selected filter equals all filters selected. So if your get an empty content filter list in your extractor make sure you return everything. By means use if statements like this `contentFilter.contains("video") || contentFilter.isEmpty()`.
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ListLinkHandler are also created by overriding the [ListLinkHandlerFactory](https://teamnewpipe.github.io/NewPipeExtractor/javadoc/org/schabi/newpipe/extractor/linkhandler/ListLinkHandlerFactory.html)
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additionally to the abstract methods this factory inherits from the LinkHandlerFactory you can override
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[getAvailableContentFilter()](https://teamnewpipe.github.io/NewPipeExtractor/javadoc/org/schabi/newpipe/extractor/linkhandler/ListLinkHandlerFactory.html#getAvailableContentFilter--)
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