PD: [skip ci] fix regression caused by fdf7e6acbe120

In the accept() method the view provider of the edited object must be made visible if it's valid as otherwise it can happen that the view is empty.

See https://forum.freecadweb.org/viewtopic.php?f=13&t=55915

src/Mod/PartDesign/Gui/TaskDraftParameters.cpp

@@ -386,6 +386,10 @@ TaskDlgDraftParameters::~TaskDlgDraftParameters()
 
 bool TaskDlgDraftParameters::accept()
 {
+    auto tobj = vp->getObject();
+    if (!tobj->isError())
+        parameter->showObject();
+
     std::vector<std::string> strings;
     App::DocumentObject* obj;
     TaskDraftParameters* draftparameter = static_cast<TaskDraftParameters*>(parameter);
@@ -403,7 +407,6 @@ bool TaskDlgDraftParameters::accept()
     //     return false;
     // }
 
-    auto tobj = vp->getObject();
     FCMD_OBJ_CMD(tobj,"Angle = " << draftparameter->getAngle());
     FCMD_OBJ_CMD(tobj,"Reversed = " << draftparameter->getReversed());
     if(neutralPlane.empty())