Fixed crash on undo layer change in TEXTE_MODULE.

pcbnew/class_text_mod.cpp

@@ -493,6 +493,9 @@ unsigned int TEXTE_MODULE::ViewGetLOD( int aLayer ) const
 {
     const int MAX = std::numeric_limits<unsigned int>::max();
 
+    if( !m_view )
+        return 0;
+
     if( m_Type == TEXT_is_VALUE && !m_view->IsLayerVisible( ITEM_GAL_LAYER( MOD_VALUES_VISIBLE ) ) )
         return MAX;
 

pcbnew/tools/edit_tool.cpp

@@ -383,6 +383,7 @@ int EDIT_TOOL::Properties( const TOOL_EVENT& aEvent )
         // Display properties dialog
         BOARD_ITEM* item = selection.Item<BOARD_ITEM>( 0 );
 
+        // Store the head of the undo list to compare if anything has changed
         std::vector<PICKED_ITEMS_LIST*>& undoList = editFrame->GetScreen()->m_UndoList.m_CommandsList;
 
         // Some of properties dialogs alter pointers, so we should deselect them