Use Collections.emptyList() in

                 Key: GIRAPH-126
             Project: Giraph
          Issue Type: Improvement
            Reporter: André Kelpe
            Priority: Minor

I am doing some tests with giraph and I am having some memory problems. While I 
was browsing through the codebase I saw that you are allocating a new ArrayList 
(which has an underlying array of 10 elements) for each Vertex, that has no 
Messages to be delivered. That's a waste of memory and time. This patch 
replaces it with the EMPTY_LIST of the Collections utility class.

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