Fix error reporting in UpdateSentStatus and make Get check if the result is undefined

added 11 commits

• 9179db39...ddcac782 - 9 commits from branch release
• b243d58f - Merge remote-tracking branch 'origin/release' into jono/dbErrorChecking
• fd885111 - Fix build constraints

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added 1 commit

• 39be4adf - Add checking of result is undefined to GetIndex and add test

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mentioned in commit 9f3539b1

merged