When yelp is run initially, rarian initializes it self generation a
linked list of reg for all of the help files. One of the structure elements
of the reg structure is the "comment", for some help files this end's up 
being NULL, which i think is the correct bahaviour from a rarian perspective.

However in yelp-search-parser.c:slow_search_process(), when a search is attempted
and this reg structure is passed, yelp attempts to use this comment field as the
default_snippet for the search. 

This can cause yelp to core in yelp-search-parser.c:search_parse_result(), as
default_snippet can be referenced and you end up referencing a NULL pointer.