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avoid NPE on empty contennts
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@ -86,7 +86,7 @@ public class MetaDataProducerMultiOutput implements MetaDataProducerOutput, Sour
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{
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List<T> rs = new ArrayList<>();
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for(MetaDataProducerOutput content : contents)
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for(MetaDataProducerOutput content : CollectionUtils.nonNullList(contents))
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{
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if(content instanceof MetaDataProducerMultiOutput multiOutput)
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{
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