[SPARK-8606] Prevent exceptions in RDD.getPreferredLocations() from crashing DAGScheduler#7023

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JoshRosen wants to merge 3 commits intoapache:masterfrom

JoshRosen:SPARK-8606

Commits on Jun 25, 2015

Add (failing) regression test for getPreferredLocations() DAGScheduler crash
JoshRosen
committed
Add test of a buggy getPartitions() method
JoshRosen
committed
Fix getPreferredLocations() DAGScheduler crash with try block.
JoshRosen
committed