I just wanted to comment that this will be fixed in version 2017.3 of R# and that it is already fixed in R# 2017.3 EAP 7 which can be downloaded from here.
Updated C# Formatting Style options for blank lines before and after statements with blocks, control transfer as well as multiline statements.
This can be configured in the R# options under Formatting Style => Blank Lines => Before/After statements with child blocks.