#3943 NORM Never A: Better support for parent types

[Zarro Boogs per Child]

#3943: Better support for parent types
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 Reporter:  marco   |       Owner:  jg            
     Type:  defect  |      Status:  new           
 Priority:  normal  |   Milestone:  Never Assigned
Component:  distro  |     Version:                
 Keywords:          |    Verified:  0             
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 There are at least two things we can do:

 * When getting a list of activities which can open a file fallback to
 parent types if there are no matches.
 * If Mime type -> Object type fails, fallback to parent types and retry.

 I think we should do this for 1.0.

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Ticket URL: <https://dev.laptop.org/ticket/3943>
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