[BUG] Cohere: invalid request: list of documents must not be empty

[langchain4j]

java.lang.RuntimeException: status code: 400; body: {"message":"invalid request: list of documents must not be empty"}
at dev.langchain4j.model.cohere.CohereClient.toException(CohereClient.java:71) ~[langchain4j-cohere-0.28.0.jar:na]
at dev.langchain4j.model.cohere.CohereClient.rerank(CohereClient.java:60) ~[langchain4j-cohere-0.28.0.jar:na]
at dev.langchain4j.model.cohere.CohereScoringModel.lambda$scoreAll$0(CohereScoringModel.java:67) ~[langchain4j-cohere-0.28.0.jar:na]
at dev.langchain4j.internal.RetryUtils$RetryPolicy.withRetry(RetryUtils.java:192) ~[langchain4j-core-0.28.0.jar:na]
at dev.langchain4j.internal.RetryUtils.withRetry(RetryUtils.java:229) ~[langchain4j-core-0.28.0.jar:na]
at dev.langchain4j.model.cohere.CohereScoringModel.scoreAll(CohereScoringModel.java:67) ~[langchain4j-cohere-0.28.0.jar:na]
at dev.langchain4j.rag.content.aggregator.ReRankingContentAggregator.reRankAndFilter(ReRankingContentAggregator.java:110) ~[langchain4j-core-0.28.0.jar:na]
at dev.langchain4j.rag.content.aggregator.ReRankingContentAggregator.aggregate(ReRankingContentAggregator.java:88) ~[langchain4j-core-0.28.0.jar:na]
at dev.langchain4j.rag.DefaultRetrievalAugmentor.augment(DefaultRetrievalAugmentor.java:146) ~[langchain4j-core-0.28.0.jar:na]
at dev.langchain4j.service.DefaultAiServices$1.invoke(DefaultAiServices.java:100) ~[langchain4j-0.28.0.jar:na]
at jdk.proxy2/jdk.proxy2.$Proxy172.answer(Unknown Source) ~[na:na]