Avoid indexing on LegacyBuildGraph.reset().

Review Request #3868 — Created May 11, 2016 and submitted — Latest diff uploaded

kwlzn
pants
kwlzn/engine/legacybuildgraph_reset
3389, 3404
pants-reviews
peiyu, stuhood

Avoid indexing on LegacyBuildGraph.reset().

Fixes #3389.

Tested against the repro in #3389 + https://travis-ci.org/pantsbuild/pants/builds/129541480

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