D20946: [EPubGenerator] Reduce nesting level in loop

[Stefan Brüns]

bruns created this revision.
bruns added a reviewer: Okular.
Herald added a project: Okular.
Herald added a subscriber: okular-devel.
bruns requested review of this revision.

REVISION SUMMARY
  The loop body is skipped when `epub_it_get_curr(it)` is invalid.
  Make it more obvious there is no more code executed in this case.

TEST PLAN
  no functional changes

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D20946

AFFECTED FILES
  generators/epub/converter.cpp

To: bruns, #okular
Cc: okular-devel, joaonetto, tfella, ngraham, darcyshen, aacid
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