Fix non-Delete of Graphic on DocObject delete

- While the source document obj was "removing", the
  graphic was being deleted and readded by the view
  provider.

src/Mod/TechDraw/App/DrawViewSymbol.cpp

@@ -66,6 +66,7 @@ DrawViewSymbol::~DrawViewSymbol()
 
 void DrawViewSymbol::onChanged(const App::Property* prop)
 {
+//    Base::Console().Message("DVS::onChanged(%s) \n",prop->getName());
     if (prop == &Symbol) {
         if (!isRestoring()) {
             //this pulls the initial values from svg into editabletexts
@@ -83,7 +84,7 @@ void DrawViewSymbol::onChanged(const App::Property* prop)
                     tbegin = twhat[0].second;
                 }
                 EditableTexts.setValues(eds);
-                requestPaint();
+//                requestPaint();
             }
         }
     }
@@ -92,6 +93,7 @@ void DrawViewSymbol::onChanged(const App::Property* prop)
 
 App::DocumentObjectExecReturn *DrawViewSymbol::execute(void)
 {
+//    Base::Console().Message("DVS::execute() \n");
     if (!keepUpdated()) {
         return App::DocumentObject::StdReturn;
     }
@@ -120,7 +122,7 @@ App::DocumentObjectExecReturn *DrawViewSymbol::execute(void)
 
     }
     Symbol.setValue(newsvg);
-    requestPaint();
+//    requestPaint();
     return DrawView::execute();
 }