[rekonq] Segfault after selecting nonexisting searchEngine

[Johannes Zellner]

Hi,

I just enabled "wolfram" searchengine and got a segfault, since the 
corresponding desktop file for this service is not installed.

I stepped through the code in this section a while and couldn't find a better 
solution to handle the situation where "SearchEngine::defaultEngine()" simply 
cannot return a valid SearchEngine pointer. So I attached a patch, that 
defaults again back to the hardcoded default engine (atm its google...)

Hopefully someone of you have a nicer solution in mind ;-)

Regards,
Johannes

PS: Personally I like the sending-patch-to-mailinglist approach, only the 
commit count is poor then ;-)
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