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d78f418c - Extract abstracts from Pubmed articles, even if they have no extra label (#10245)

Extract abstracts from Pubmed articles, even if they have no extra label (#10245) ### Description This pull request involves modifications to the extraction method for abstracts/summaries within the PubMed utility. A condition has been added to verify the presence of unlabeled abstracts. Now an abstract will be extracted even if it does not have a subtitle. In addition, the extraction of the abstract was extended to books. ### Issue The PubMed utility occasionally returns an empty result when extracting abstracts from articles, despite the presence of an abstract for the paper on PubMed. This issue arises due to the varying structure of articles; some articles follow a "subtitle/label: text" format, while others do not include subtitles in their abstracts. An example of the latter case can be found at: [https://pubmed.ncbi.nlm.nih.gov/37666905/](url) --------- Co-authored-by: Bagatur <baskaryan@gmail.com>