Merge pull request #16858 from alalek:core_fix_empty_iterator_begin_end
authorAlexander Alekhin <alexander.a.alekhin@gmail.com>
Fri, 20 Mar 2020 19:32:55 +0000 (19:32 +0000)
committerAlexander Alekhin <alexander.a.alekhin@gmail.com>
Fri, 20 Mar 2020 19:32:55 +0000 (19:32 +0000)

Trivial merge