fixed panic on calling updateMetadata on closed client#1531

Merged

bai merged 3 commits intoIBM:masterfrom roblaszczak:master

Nov 12, 2019

+30-12

Commits on Nov 1, 2019

fixed panic on calling updateMetadata on closed client
roblaszczak
committed

Commits on Nov 2, 2019

fixed race conditions and nil panic on calling registerBroker after close
roblaszczak
committed

Commits on Nov 12, 2019

added comments for handleError
roblaszczak
committed