Fix putting null into ConcurrentHashMap

ConcurrentHashMap does not allow null key and value.

Change-Id: Id50b16c727b602cafc4d745bf63813587b4b4519
CRs-Fixed: 2329882
1 file changed
tree: f9f4be00a254db39df5e09dfbfd16ebb60dc39b2
  1. ims/
  2. internal/