+ fix possible crashes in mirror and polar pattern feature

src/Mod/PartDesign/App/FeatureTransformed.cpp

@@ -41,6 +41,7 @@
 #include "FeatureSubtractive.h"
 #include "FeatureMirrored.h"
 #include "FeatureLinearPattern.h"
+#include "FeaturePolarPattern.h"
 
 #include <Base/Console.h>
 #include <Base/Exception.h>
@@ -87,6 +88,16 @@ App::DocumentObject* Transformed::getSketchObject() const
         const LinearPattern* pattern = static_cast<const LinearPattern*>(this);
         return pattern->Direction.getValue();
     }
+    else if (this->getTypeId().isDerivedFrom(PolarPattern::getClassTypeId())) {
+        // if Originals is empty then try the polar pattern's Axis property
+        const PolarPattern* pattern = static_cast<const PolarPattern*>(this);
+        return pattern->Axis.getValue();
+    }
+    else if (this->getTypeId().isDerivedFrom(Mirrored::getClassTypeId())) {
+        // if Originals is empty then try the mirror pattern's MirrorPlane property
+        const Mirrored* pattern = static_cast<const Mirrored*>(this);
+        return pattern->MirrorPlane.getValue();
+    }
     else {
         return 0;
     }