Fix deleting a Part

src/App/Document.cpp

@@ -2173,6 +2173,10 @@ int Document::recompute()
         delete LogEntry;
     _RecomputeLog.clear();
 
+    //do we have anything to do?
+    if(d->objectMap.empty())
+        return 0;
+    
     // get the sorted vector of all objects in the document and go though it from the end
     vector<DocumentObject*> topoSortedObjects = topologicalSort();
 

src/App/OriginGroupExtension.cpp

@@ -195,7 +195,7 @@ std::vector< DocumentObject* > OriginGroupExtension::addObjects(std::vector<Docu
 
 bool OriginGroupExtension::hasObject(const DocumentObject* obj, bool recursive) const {
     
-    if(obj == getOrigin() || getOrigin()->hasObject(obj))
+    if(Origin.getValue() && (obj == getOrigin() || getOrigin()->hasObject(obj)))
         return true;
     
     return App::GroupExtension::hasObject(obj, recursive);

src/Gui/ViewProviderOriginGroupExtension.cpp

@@ -121,8 +121,7 @@ void ViewProviderOriginGroupExtension::slotChangedObjectApp ( const App::Documen
 }
 
 void ViewProviderOriginGroupExtension::slotChangedObjectGui ( const Gui::ViewProviderDocumentObject& vp) {
-    if ( !vp.hasExtension ( Gui::ViewProviderOrigin::getClassTypeId () ) &&
-         !vp.isDerivedFrom ( Gui::ViewProviderOriginFeature::getClassTypeId () ) ) {
+    if ( !vp.isDerivedFrom ( Gui::ViewProviderOriginFeature::getClassTypeId () )) {
         // Ignore origins to avoid infinite recursion (not likely in a well-formed focument, 
         //          but may happen in documents designed in old versions of assembly branch )
         auto* group = getExtendedViewProvider()->getObject()->getExtensionByType<App::OriginGroupExtension>();
@@ -135,6 +134,10 @@ void ViewProviderOriginGroupExtension::slotChangedObjectGui ( const Gui::ViewPro
 }
 
 void ViewProviderOriginGroupExtension::updateOriginSize () {
+    
+    if(getExtendedViewProvider()->getObject()->isDeleting())
+        return;
+    
     auto* group = getExtendedViewProvider()->getObject()->getExtensionByType<App::OriginGroupExtension>();
     if(!group)
         return;