Remove SectionLine on delete or cancel

src/Mod/TechDraw/Gui/QGIViewPart.cpp

@@ -553,6 +553,11 @@ void QGIViewPart::drawSectionLine(TechDraw::DrawViewSection* viewSection, bool b
         !viewSection)  {
         return;
     }
+    
+    if (!viewSection->hasGeometry()) {
+        return;
+    }
+    
     if (b) {
         QGISectionLine* sectionLine = new QGISectionLine();
         addToGroup(sectionLine);

src/Mod/TechDraw/Gui/TaskSectionView.cpp

@@ -302,6 +302,8 @@ bool TaskSectionView::reject()
                             PageName.c_str(),SectionName.c_str());
     Gui::Command::doCommand(Gui::Command::Gui,"App.activeDocument().removeObject('%s')",SectionName.c_str());
     Gui::Command::doCommand(Gui::Command::Gui,"Gui.ActiveDocument.resetEdit()");
+    m_base->touch();
+    m_base->getDocument()->recompute();
     return false;
 }