[TD] remove more superfluous nullptr checks

src/Mod/TechDraw/Gui/Command.cpp

@@ -876,7 +876,7 @@ void CmdTechDrawBalloon::activated(int iMsg)
     std::vector<Gui::SelectionObject> selection = getSelection().getSelectionEx();
 
     auto objFeat(dynamic_cast<TechDraw::DrawViewPart*>(selection[0].getObject()));
-    if (objFeat == nullptr) {
+    if (!objFeat) {
         return;
     }
 
@@ -1266,7 +1266,7 @@ void CmdTechDrawArchView::activated(int iMsg)
         return;
     }
 
-    if (archObject == nullptr) {
+    if (!archObject) {
         QMessageBox::warning(Gui::getMainWindow(), QObject::tr("Wrong selection"),
             QObject::tr("No Arch Sections in selection."));
         return;