[Tickets #13809] deleting parent task before child task makes child unaccessible

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Ticket URL: https://bugs.horde.org/ticket/13809
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  Ticket             | 13809
  Created By         | horde at equaeghe.nospammail.net
  Summary            | deleting parent task before child task makes child
                     | unaccessible
  Queue              | Nag
  Version            | 4.2.3
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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horde at equaeghe.nospammail.net (2015-01-16 11:47) wrote:

When a parent tag is deleted before a child tag, the child tag becomes  
unaccessible: any attempt to access it causes a error message ?Task  
not found? to be displayed and no action to be taken. Furthermore, the  
calendar becomes unsyncable (via CalDav) from Lightning, the  
Thunderbird calendar component.

When I iCal-export the task list, the Related-To attribute of the the  
child task is still there, empty. This may be relevant.

Currently the only workaround I found is to create a new calendar and  
copy move all non-orphaned tasks to there and delete the old one, with  
the orphans still there.
Is there a faster workaround for solving this problem, deleting the  
orphaned tasks in some way, or ?editing the raw iCal??