IGetPreviewIconHandler - handling preview unavailable

There are cases when a preview is not available server side (in the DAM). What should be the approach in these cases in the IGetPreviewIconHandler implementation?
Our assumption is to throw a NotFoundException. This leads to the correct result in the UI (both the AD version panel and Bridge seem to handle it correctly). Throwing the exception however also results in an uncaught exception in the AD log, which indicates that the thrown NotFoundException is not properly handled.
2012/04/24 14:33:52,444 [JobHandler-3] ERROR JobHandler - Uncaught exception during system job execution.
java.lang.reflect.UndeclaredThrowableException
     at $Proxy0.execute(Unknown Source)
     at com.adobe.drive.data.manager.call.GetPreviewIconCall.run(GetPreviewIconCall.java:100)
     at com.adobe.drive.data.manager.call.GetPreviewIconCall.run(GetPreviewIconCall.java:50)
     at com.adobe.drive.manager.executor.ManagerCallWrapper.run(ManagerCallWrapper.java:69)
     at com.adobe.drive.data.internal.persistence.PersistenceRunner$2.runWithTransaction(PersistenceRunner.java:186)
     at com.adobe.drive.data.internal.persistence.PersistenceModificationCallable.run(PersistenceModificationCallable.java:71)
     at com.adobe.drive.data.internal.persistence.PersistenceRunner.run(PersistenceRunner.java:119)
     at com.adobe.drive.data.internal.persistence.PersistenceRunner.runWithTransaction(PersistenceRunner.java:181)
     at com.adobe.drive.manager.internal.executor.ManagerCallExecutor.execute(ManagerCallExecutor.java:69)
     at com.adobe.drive.internal.data.manager.DataManager$12.run(DataManager.java:3142)
     at com.adobe.drive.internal.data.manager.DataManager$12.run(DataManager.java:3130)
     at com.adobe.drive.internal.data.manager.ExceptionHandler.runProtected(ExceptionHandler.java:45)
     at com.adobe.drive.internal.data.manager.DataManager.getPreviewThumbnail(DataManager.java:3129)
     at com.adobe.drive.internal.biz.versioncue.service.call.GetPreviewThumbnail.executeItem(GetPreviewThumbnail.java:92)
     at com.adobe.drive.internal.biz.versioncue.service.call.GetPreviewThumbnail.executeItem(GetPreviewThumbnail.java:44)
     at com.adobe.drive.internal.biz.versioncue.service.call.VersionCueCall$1.run(VersionCueCall.java:125)
     at com.adobe.drive.internal.biz.versioncue.service.call.VersionCueCall$1.run(VersionCueCall.java:119)
     at com.adobe.drive.data.internal.persistence.PersistenceRunner.run(PersistenceRunner.java:119)
     at com.adobe.drive.internal.biz.versioncue.service.call.VersionCueCall.execute(VersionCueCall.java:134)
     at com.adobe.drive.internal.biz.versioncue.service.VersionCueService.getPreviewThumbnail(VersionCueService.java:358)
     at com.adobe.drive.ncomm.versioncue.GetPreviewThumbnail.handle(GetPreviewThumbnail.java:58)
     at com.adobe.drive.ncomm.versioncue.VersionCueRequestHandler$1.run(VersionCueRequestHandler.java:185)
     at com.adobe.drive.core.internal.jobs.JobHandler$JobWrapper.run(JobHandler.java:270)
     at com.adobe.drive.core.internal.jobs.JobHandler$JobWrapper.run(JobHandler.java:286)
     at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
     at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.reflect.InvocationTargetException
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at com.adobe.drive.manager.executor.ManagerCallContext$RemoteHandlerProxy.invoke(ManagerCallContext.java:202)
     ... 27 more
Caused by: com.adobe.drive.connector.api.exception.NotFoundException: Cannot generate preview for '/Demo Zone/Images/Food/Sandwich.jpg'
     at com.ds.acm.drive.logic.handler.GetPreviewIconHandler$1.postProcessResponse(GetPreviewIconHandler.java:130)
     at com.ds.acm.drive.logic.handler.GetPreviewIconHandler$1.postProcessResponse(GetPreviewIconHandler.java:1)
     at com.ds.acm.drive.logic.handler.template.BasicTemplate.process(BasicTemplate.java:148)
     at com.ds.acm.drive.logic.handler.GetPreviewIconHandler.executeInternal(GetPreviewIconHandler.java:136)
     at com.ds.acm.drive.logic.handler.GetPreviewIconHandler.executeInternal(GetPreviewIconHandler.java:1)
     at com.ds.acm.drive.logic.handler.base.HandlerBase.execute(HandlerBase.java:54)
     ... 32 more

Sorry, no reply yet, although some people seem to be trying the LR4 beta to try and circumvent the same issue...

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