Fix crashes when the list of formts is empty.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@34393 a592a061-630c-0410-9148-cb99ea01b6c8

diff --git a/src/frontends/qt4/GuiPrefs.cpp b/src/frontends/qt4/GuiPrefs.cpp
index 796b31591b2ee62f68969cc16efb6834a51dabec..1831d8a8ccffdf28b73cbaa96f6866b5c07d660f 100644 (file)
--- a/src/frontends/qt4/GuiPrefs.cpp
+++ b/src/frontends/qt4/GuiPrefs.cpp
@@ -1523,6 +1523,8 @@ void PrefConverters::changeConverter()
 
 void PrefConverters::updateButtons()
 {
+       if (form_->formats().size() == 0)
+               return;
        Format const & from = form_->formats().get(converterFromCO->currentIndex());
        Format const & to = form_->formats().get(converterToCO->currentIndex());
        int const sel = form_->converters().getNumber(from.name(), to.name());
@@ -1801,6 +1803,8 @@ void PrefFileformats::updateView()
 
 void PrefFileformats::on_formatsCB_currentIndexChanged(int i)
 {
+       if (form_->formats().size() == 0)
+               return;
        int const nr = formatsCB->itemData(i).toInt();
        Format const f = form_->formats().get(nr);