fix scan coverity issues: unchecked dynamic_cast

src/Mod/TechDraw/Gui/CommandDecorate.cpp

@@ -175,6 +175,9 @@ void CmdTechDrawNewGeomHatch::activated(int iMsg)
     geomhatch->Source.setValue(objFeat, subNames);
     Gui::ViewProvider* vp = Gui::Application::Instance->getDocument(getDocument())->getViewProvider(geomhatch);
     TechDrawGui::ViewProviderGeomHatch* hvp = dynamic_cast<TechDrawGui::ViewProviderGeomHatch*>(vp);
+    if( hvp == nullptr ) {
+        return;
+    }
 //    if (!hvp) {
 
     // dialog to fill in hatch values

src/Mod/TechDraw/Gui/QGIViewImage.cpp

@@ -115,6 +115,8 @@ void QGIViewImage::draw()
     }
 
     auto viewImage( dynamic_cast<TechDraw::DrawViewImage*>(getViewObject()) );
+    if (!viewImage)
+        return;
     QRectF newRect(0.0,0.0,Rez::guiX(viewImage->Width.getValue()),Rez::guiX(viewImage->Height.getValue()));
     double pad = Rez::guiX(1.0);
     m_cliparea->setRect(newRect.adjusted(-pad,-pad,pad,pad));