[ROCKETMQ-204]-when all brokers is offline, client still attempts to send heartbeat#115

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Jaskey wants to merge 3 commits intoapache:masterfrom

Jaskey:ROCKETMQ-204-heartbeat-issue-when-topicRouteInfo-becomes-nonexist

Commits on Jun 7, 2017

add unit test to show the problem of topic route info becomes non-exist
Jaskey
committed

Commits on Jun 9, 2017

returns null from getTopicRouteInfoFromNameServer when topic not exist
Jaskey
committed
[ROCKETMQ-204]-fix the bug that when all brokers is offline, client still attempts to send heartbeat
Jaskey
committed