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This PR fixes the root cause of two edge cases, which sometimes intersect: documents with single (or duplicate) documents that have no keywords. In theses cases, two bugs could occur individually or simultaneously: appearance of stopwords in bubble titles that should be excluded; wrongly increased number of bubbles.
The bubble title replacement was not working at the correct level: instead of replacing single bubble titles for one (or multiple) documents, multiple area titles were created according to the count of documents with missing subjects.
This issue has now been fixed, resulting in correct number of bubbles and preventing appearance of stopwords in bubble titles.