regression in view query, not all items returned

Automated regression test:
1) Create a view
2) Add 10000 items
3) Query the view and verify all 10000 items

We are only getting back 9900 items

Traced back to commit:
Remove expensive dict:append calls until necessary.

Change-Id: Ia1155543e6d6214714dc1d51641d2e9eeeaaa478

repo/cluster_run based reproduction:
cd testrunner && make test TESTNAME=viewtests.ViewTests.test_count_reduce_10k_docs