Java error when a node is removed - need to check for pending state on a bucket

This is related to CBSE-187.

While the test was running we removed a node from the cluster, there were failures due to operation cancelled and TimeoutException and the test didn't continue.
Then we started the test again without adding back the removed node, it just threw:
       java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.ArrayList.get(Unknown Source)
at com.couchbase.client.vbucket.config.DefaultConfig.getServer(DefaultConfig.java:81)
at com.couchbase.client.vbucket.VBucketNodeLocator.getPrimary(VBucketNodeLocator.java:74)
at com.couchbase.client.CouchbaseConnection.addOperation(CouchbaseConnection.java:143)
at net.spy.memcached.MemcachedConnection.enqueueOperation(MemcachedConnection.java:639)
at net.spy.memcached.MemcachedClient.asyncStore(MemcachedClient.java:296)
at net.spy.memcached.MemcachedClient.set(MemcachedClient.java:727)
<supressed>