Fix for #495 Search Results doubled.

I don't know if the search issue service is being changed but it was returning in both calls for open and closed issues the same issues, I would like to use a Set in this approach but I could not modify the SearchIssue object in order to modify equals method so I used the filter with a HashMap/SparseArray approach.

I could not find unit tests, let me know if unit test is needed for the filterSearch method and I will provide it asap.

Cheers.