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lib/drb/extservm.rb (service): do not return `false'
invoke_service_command may set entries in @servers to `false',
making it incompatible with the intended use of the
safe navigation operator.
This caused occasional DRb test failures, but they were hidden
with automatic retry.
[ruby-core:87524] [Bug #14856]
Fixes: r53111 ("use safe navigation operator")
commit 059c9c1cf3 [GH-1142]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@64128 b2dd03c8-39d4-4d8f-98ff-823fe69b080e