fix Coverity issues

src/Mod/Part/App/Attacher.cpp

@@ -733,9 +733,6 @@ GProp_GProps AttachEngine::getInertialPropsOfShape(const std::vector<const TopoD
     default:
         throw Base::Exception("AttachEngine::getInertialPropsOfShape: unexpected shape type");
     }
-
-    assert(false);//exec shouldn't ever get here
-    return GProp_GProps();
 }
 
 /*!

src/Mod/Part/App/FeatureExtrusion.cpp

@@ -346,7 +346,7 @@ bool Extrusion::isInside(const TopoDS_Wire& wire1, const TopoDS_Wire& wire2) con
         // because otherwise we have some intersections which is not allowed
         else
             return false;
-        xp.Next();
+        //xp.Next();
     }
 
     return false;

src/Mod/Part/App/GeometryCurvePyImp.cpp

@@ -464,9 +464,6 @@ PyObject* GeometryCurvePy::makeRuledSurface(PyObject *args)
         PyErr_SetString(PartExceptionOCCError, e->GetMessageString());
         return 0;
     }
-
-    PyErr_SetString(PartExceptionOCCError, "Geometry is not a curve");
-    return 0;
 }
 
 PyObject* GeometryCurvePy::intersect2d(PyObject *args)

src/Mod/Part/App/TopoShape.cpp

@@ -2313,11 +2313,11 @@ struct MeshVertex
     Standard_Integer i;
 
     MeshVertex(Standard_Real X, Standard_Real Y, Standard_Real Z)
-        : x(X),y(Y),z(Z)
+        : x(X),y(Y),z(Z),i(0)
     {
     }
     MeshVertex(const gp_Pnt& p)
-        : x(p.X()),y(p.Y()),z(p.Z())
+        : x(p.X()),y(p.Y()),z(p.Z()),i(0)
     {
     }
 

src/Mod/Part/App/TopoShapeEdgePyImp.cpp

@@ -624,9 +624,6 @@ PyObject* TopoShapeEdgePy::split(PyObject *args)
         PyErr_SetString(PartExceptionOCCError, e->GetMessageString());
         return 0;
     }
-
-    PyErr_SetString(PartExceptionOCCError, "Geometry is not a curve");
-    return 0;
 }
 
 PyObject* TopoShapeEdgePy::isSeam(PyObject *args)

src/Mod/Part/App/TopoShapeFacePyImp.cpp

@@ -683,10 +683,9 @@ Py::Object TopoShapeFacePy::getOuterWire(void) const
         TopoDS_Wire clWire = ShapeAnalysis::OuterWire(clFace);
         return Py::Object(new TopoShapeWirePy(new TopoShape(clWire)),true);
     }
-    else
+    else {
         throw Py::Exception("Internal error, TopoDS_Shape is not a face!");
-
-    return Py::Object();
+    }
 }
 
 Py::Object TopoShapeFacePy::getMass(void) const