Update empty extra_vars and PE router list in ibgp mesh update

requested review from @Aleksandr.Kurbatov

assigned to @karel.vanklink

approved this merge request

added 17 commits

• cf9a1cfc...3a5d8c03 - 15 commits from branch develop
• b0b1a811 - prevent sending an empty extra_vars in iBGP check run
• 022e5180 - Update PE router list attribute in ibgp mesh update

Compare with previous version

enabled an automatic merge when all merge checks for 022e5180 pass

aborted the automatic merge because target branch was updated

added 3 commits

• d1774281 - 1 commit from branch develop
• e26f82d0 - prevent sending an empty extra_vars in iBGP check run
• 456a7004 - Update PE router list attribute in ibgp mesh update

Compare with previous version

enabled an automatic merge when all merge checks for 456a7004 pass

merged