Merge branch 'dk-issue-68-get_discussions_by_blog' into 'develop'

Bartek Wronarequested to merge
cherry-pick-18a33652 into deployed_20200928

get_discussion_by_blog speedup

See merge request !236 (merged)

(cherry picked from commit 18a33652)

df850035 get_discussion_by_blog speedup

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