fix(docstore/mongodocstore): check length of sets in newUpdateDoc function #3394
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This PR resolves issue #3393.
This update modifies the newUpdateDoc function in the docstore/mongodocstore package to check the length of the 'sets' variable before adding the '$set' field to the 'updateDoc' map. This prevents an error when calling the update function with only 'unset' or 'inc' modifiers and no 'set' modifiers.