Avoid out of range exceptions.

apps/opencs/model/world/idtable.cpp

@@ -29,7 +29,7 @@ int CSMWorld::IdTable::columnCount (const QModelIndex & parent) const
 
 QVariant CSMWorld::IdTable::data  (const QModelIndex & index, int role) const
 {
-    if (role!=Qt::DisplayRole && role!=Qt::EditRole)
+    if ((role!=Qt::DisplayRole && role!=Qt::EditRole) || index.row() < 0 || index.column() < 0)
         return QVariant();
 
     if (role==Qt::EditRole && !mIdCollection->getColumn (index.column()).isEditable())

apps/opencs/view/render/pagedworldspacewidget.cpp

@@ -50,7 +50,7 @@ bool CSVRender::PagedWorldspaceWidget::adjustCells()
     {
         int index = cells.searchId (iter->getId (mWorldspace));
 
-        if (index!=0 && cells.getRecord (index).mState!=CSMWorld::RecordBase::State_Deleted &&
+        if (index > 0 && cells.getRecord (index).mState!=CSMWorld::RecordBase::State_Deleted &&
             mCells.find (*iter)==mCells.end())
         {
             if (setCamera)