PSPP-BUG: [bug #20874] Exit gracefully if glade files cannot be found.

[John Darrington]

Follow-up Comment #3, bug #20874 (project pspp):


> Usually software should be written so that data files cannot cause it to
crash. 

To talk about that, we need to define "data file" and "crash". The glade
files can be considered `code' which happens to be written in XML instead of
C.  Similary, is an assertion failure a `crash' or an error message followed
by exit?

If an out-of-date glade file, doesn't provide an essential widget, or the set
of properties that the code expects, then there is no way the code could
handle this (in the genreal case). The only sensible thing it can do is give
up.   The question is, when should it decide to give up? and what error
message(s) should it produce?

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