[Dune] [#823] ConfigParser and ParameterTree segfault when accessing an inexistent subtree

[Dune]

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User who did this - Christian Engwer (christi) 

Attached to Project - Dune
Summary - ConfigParser and ParameterTree segfault when accessing an inexistent subtree
Task Type - Bug Report
Category - Common
Status - New
Assigned To - 
Operating System - Unspecified / All
Severity - Low
Priority - Normal
Reported Version - 2.0
Due in Version - 2.1
Due Date - Undecided
Details - There is no check for the existence of a subtree. If I get a subtree object for an inexistent subtree and then try to get a value I receive a segfault.

I boiled tis problem down to missing checks and updated the dune/common/test/paramtreetest accordingly. There are two non-detected errors:
- I can access inexistent subtrees
- I can access keys as subtrees

I guess this is all more or less the same problem.

Christian

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