[Email Thread] Display registered and not registered receivers

ticket https://code.vereign.com/code/dashboard/issues/401

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• 3ce0743e - small refactor of emailUtilities. splitParticipants method

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@igor.markin fixed

resolved all discussions

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@alexey.lunin thanks, reviewed

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@viktor.popov @damyan.mitev please review

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• 36f8eb5d - Check if email participants are null

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• ef6422a9 - Fix the issue when plain part not found

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assigned to @gospodin.bodurov

merged

mentioned in commit 956b374c