D20877: Fix exivextractor crash with malformed files

[Alexander Stippich]

astippich added inline comments.

INLINE COMMENTS

> bruns wrote in exiv2extractor.cpp:299
> `!it->empty()` ?

Unfortunately, empty() does not exist. Same was done in https://phabricator.kde.org/D16165

REPOSITORY
  R286 KFileMetaData

REVISION DETAIL
  https://phabricator.kde.org/D20877

To: astippich, bruns
Cc: kde-frameworks-devel, #baloo, gennad, domson, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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