[PD-dev] PDContainer h_map fix

[Lorenz Schori]

hi

there is (at least) one bug in the PDContainer external which brought  
pd-0.39 miller to crash on my macos x 10.4.2 powerbook g4. map  
MapBase::get() does not check if an element was actually found for  
the key and may return garbage data which leads to the crash.  
attached is a patch which fixes this issue using a pointer instead of  
a reference as return value and setting it to NULL if the key has no  
element associated with.

i did not look into the other classes which may have similiar  
problems (multimap?,set?,...).

  - lorenz



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