KMimeType::findByUrl() returning null pointer

[Hamish Rodda]

Hi,

I'm encountering a crash in KFileInfo from a dereference of a null mimetype 
pointer in QString KFileItem::mimetype() const.  It turns out that the file 
(kdelibs/kate/tests/highlight.asm-avr) is detected as text/x-assembler, and 
there is no corresponding desktop file so findByUrl() returns null.

What is the correct fix here (other than creating the x-assembler desktop 
file, of course)... should KMimeType::findByUrl() check that the mimetype it 
has looked up is valid before returning it? (The docs say that a null pointer 
cannot be returned)

Cheers,
Hamish.
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