Description of problem:

An exception is thrown during HSMClearTaskVDSCommand:

Error in the engine - 

2017-06-21 09:30:17,609+03 ERROR [org.ovirt.engine.core.bll.job.JobRepositoryImpl] (org.ovirt.thread.pool-6-thread-38) [disks_syncAction_376ef93d-3f7a-4149] Failed to save step '846f016e-6a8f-4ecf-9a06-4f7375129b91', 'FINALIZING': CallableStatementCallback; SQL [{call insertstep(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)}]; ERROR: insert or update on table "step" violates foreign key constraint "fk_step_job"
  Detail: Key (job_id)=(c6fc638d-34c2-4d62-9844-74dd2238e8a9) is not present in table "job".
  Where: SQL statement "INSERT INTO step (
        step_id,
        parent_step_id,
        job_id,
        step_type,
        description,
        step_number,
        status,
        progress,
        start_time,
        end_time,
        correlation_id,
        external_id,
        external_system_type,
        is_external
        )
    VALUES (
        v_step_id,
        v_parent_step_id,
        v_job_id,
        v_step_type,
        v_description,
        v_step_number,
        v_status,
        v_progress,
        v_start_time,
        v_end_time,
        v_correlation_id,
        v_external_id,
        v_external_system_type,
        v_is_external
        )"
PL/pgSQL function insertstep(uuid,uuid,uuid,character varying,text,integer,character varying,smallint,timestamp with time zone,timestamp with time zone,character varying,uuid,character varying,boolean) line 3 at SQL statement; nested exception is org.postgresql.util.PSQLException: ERROR: insert or update on table "step" violates foreign key constraint "fk_step_job"
  Detail: Key (job_id)=(c6fc638d-34c2-4d62-9844-74dd2238e8a9) is not present in table "job".
  Where: SQL statement "INSERT INTO step (
        step_id,
        parent_step_id,
        job_id,
        step_type,
        description,
        step_number,
        status,
        progress,
        start_time,
        end_time,
        correlation_id,
        external_id,
        external_system_type,
        is_external
        )
    VALUES (
        v_step_id,
        v_parent_step_id,
        v_job_id,
        v_step_type,
        v_description,
        v_step_number,
        v_status,
        v_progress,
        v_start_time,
        v_end_time,
        v_correlation_id,
        v_external_id,
        v_external_system_type,
        v_is_external
        )"
PL/pgSQL function insertstep(uuid,uuid,uuid,character varying,text,integer,character varying,smallint,timestamp with time zone,timestamp with time zone,character varying,uuid,character varying,boolean) line 3 at SQL statement
2017-06-21 09:30:17,610+03 INFO  [org.ovirt.engine.core.bll.storage.disk.image.RemoveImageCommand] (org.ovirt.thread.pool-6-thread-38) [disks_syncAction_376ef93d-3f7a-4149] Ending command 'org.ovirt.engine.core.bll.storage.disk.image.RemoveImageCommand' successfully.
2017-06-21 09:30:17,613+03 ERROR [org.ovirt.engine.core.bll.tasks.CommandAsyncTask] (org.ovirt.thread.pool-6-thread-38) [disks_syncAction_376ef93d-3f7a-4149] [within thread]: endAction for action type RemoveImage threw an exception.: java.lang.NullPointerException
	at org.ovirt.engine.core.bll.job.ExecutionHandler.endJob(ExecutionHandler.java:520) [bll.jar:]
	at org.ovirt.engine.core.bll.job.ExecutionHandler.endTaskJobIfNeeded(ExecutionHandler.java:851) [bll.jar:]
	at org.ovirt.engine.core.bll.CommandBase.endStepsAndJobIfNeeded(CommandBase.java:590) [bll.jar:]
	at org.ovirt.engine.core.bll.CommandBase.endAction(CommandBase.java:563) [bll.jar:]
	at org.ovirt.engine.core.bll.tasks.DecoratedCommand.endAction(DecoratedCommand.java:17) [bll.jar:]
	at org.ovirt.engine.core.bll.tasks.CoCoAsyncTaskHelper.endAction(CoCoAsyncTaskHelper.java:337) [bll.jar:]
	at org.ovirt.engine.core.bll.tasks.CommandCoordinatorImpl.endAction(CommandCoordinatorImpl.java:340) [bll.jar:]
	at org.ovirt.engine.core.bll.tasks.CommandAsyncTask.endCommandAction(CommandAsyncTask.java:154) [bll.jar:]
	at org.ovirt.engine.core.bll.tasks.CommandAsyncTask.lambda$endActionIfNecessary$0(CommandAsyncTask.java:106) [bll.jar:]
	at org.ovirt.engine.core.utils.threadpool.ThreadPoolUtil$InternalWrapperRunnable.run(ThreadPoolUtil.java:84) [utils.jar:]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [rt.jar:1.8.0_131]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [rt.jar:1.8.0_131]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_131]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_131]
	at java.lang.Thread.run(Thread.java:748) [rt.jar:1.8.0_131]

2017-06-21 09:30:17,614+03 INFO  [org.ovirt.engine.core.bll.tasks.CommandAsyncTask] (org.ovirt.thread.pool-6-thread-38) [disks_syncAction_376ef93d-3f7a-4149] CommandAsyncTask::HandleEndActionResult: endAction for action type 'RemoveImage' threw an unrecoverable RuntimeException the task will be cleared.
2017-06-21 09:30:17,617+03 INFO  [org.ovirt.engine.core.bll.tasks.SPMAsyncTask] (org.ovirt.thread.pool-6-thread-38) [disks_syncAction_376ef93d-3f7a-4149] BaseAsyncTask::removeTaskFromDB: Removed task '50e8f07a-26ff-4733-b836-f20f2fb34061' from DataBase
2017-06-21 09:30:17,617+03 INFO  [org.ovirt.engine.core.bll.tasks.CommandAsyncTask] (org.ovirt.thread.pool-6-thread-38) [disks_syncAction_376ef93d-3f7a-4149] CommandAsyncTask::HandleEndActionRuntimeException: Removing CommandMultiAsyncTasks object for entity '5fe84ab4-d124-4fb9-8ec0-1db553c9ab8e'


Version-Release number of selected component (if applicable):
vdsm-4.19.19-1.el7ev.x86_64
ovirt-engine-4.1.3.4-0.1.el7.noarch

How reproducible:
?

Steps to Reproduce:
Occurred during automation run (failed to reproduced it localy)- 

1. In environment with template which has disk on 2 domains (copies)
2. Create a VM with disk from template as thin on the first domain
3. Enter the second domain to maintenance
4. Run the VM
5. Try to migrate the VM to the second domain. 

Actual results:
An exception was thrown

Expected results:
We should fail to migrate the disk

Additional info:
Engine log attached