Get string description of exception category. 
Returns "E57 Exception" for all E57Exceptions, no matter what the errorCode. 
- Postcondition:
 - No visible state is modified. 
 
- Returns:
 - The string description of exception category. 
 
- Exceptions:
 - 
  
  
 
- See also:
 - E57ExceptionsFunctions.cpp example