VM fails to start in a RHEV environment with Null Pointer Exception in getMemoryFromSnapshot

Issue

• VM fails to start and reports the following in the RHEV Admin Portal Event Log;

Failed to run VM xyz (User: aaa@bbb.com).

• The engine log contains a NullPointerException (NPE) in getMemoryFromSnapshot();

2016-04-12 11:37:08,647 ERROR [org.ovirt.engine.core.bll.RunVmCommand] (org.ovirt.thread.pool-7-thread-23) [342faf7d] Command org.ovirt.engine.core.bll.RunVmCommand throw exception: java.lang.NullPointerException
        at org.ovirt.engine.core.bll.RunVmCommand.getMemoryFromSnapshot(RunVmCommand.java:154) [bll.jar:]
        at org.ovirt.engine.core.bll.RunVmCommand.initVm(RunVmCommand.java:711) [bll.jar:]
        at org.ovirt.engine.core.bll.RunVmCommand.executeVmCommand(RunVmCommand.java:275) [bll.jar:]
        at org.ovirt.engine.core.bll.VmCommand.executeCommand(VmCommand.java:105) [bll.jar:]
        at org.ovirt.engine.core.bll.CommandBase.executeWithoutTransaction(CommandBase.java:1193) [bll.jar:]
        at org.ovirt.engine.core.bll.CommandBase.executeActionInTransactionScope(CommandBase.java:1332) [bll.jar:]
        at org.ovirt.engine.core.bll.CommandBase.runInTransaction(CommandBase.java:1961) [bll.jar:]
        at org.ovirt.engine.core.utils.transaction.TransactionSupport.executeInSuppressed(TransactionSupport.java:174) [utils.jar:]
        at org.ovirt.engine.core.utils.transaction.TransactionSupport.executeInScope(TransactionSupport.java:116) [utils.jar:]
        at org.ovirt.engine.core.bll.CommandBase.execute(CommandBase.java:1356) [bll.jar:]
        at org.ovirt.engine.core.bll.CommandBase.executeAction(CommandBase.java:353) [bll.jar:]
        at org.ovirt.engine.core.bll.MultipleActionsRunner.executeValidatedCommand(MultipleActionsRunner.java:193) [bll.jar:]
        at org.ovirt.engine.core.bll.MultipleActionsRunner.runCommands(MultipleActionsRunner.java:160) [bll.jar:]
        at org.ovirt.engine.core.bll.SortedMultipleActionsRunnerBase.runCommands(SortedMultipleActionsRunnerBase.java:20) [bll.jar:]
        at org.ovirt.engine.core.bll.MultipleActionsRunner$2.run(MultipleActionsRunner.java:169) [bll.jar:]
        at org.ovirt.engine.core.utils.threadpool.ThreadPoolUtil$InternalWrapperRunnable.run(ThreadPoolUtil.java:90) [utils.jar:]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [rt.jar:1.7.0_85]
        at java.util.concurrent.FutureTask.run(FutureTask.java:262) [rt.jar:1.7.0_85]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_85]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_85]
        at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_85]