+ fix compiler warnings

src/Mod/Sketcher/App/Sketch.cpp

@@ -912,6 +912,7 @@ int Sketch::addConstraint(const Constraint *constraint)
         }
         break;
     case None:
+    case NumConstraintTypes:
         break;
     }
 

src/Mod/Sketcher/Gui/TaskSketcherConstrains.cpp

@@ -263,6 +263,7 @@ public:
 
         switch (constraint->Type) {
         case Sketcher::None:
+        case Sketcher::NumConstraintTypes:
             assert( false );
             return false;
         case Sketcher::Horizontal:

src/Mod/Sketcher/Gui/ViewProviderSketch.cpp

@@ -3899,6 +3899,7 @@ Restart:
                 case Coincident: // nothing to do for coincident
                 case None:
                 case InternalAlignment:
+                case NumConstraintTypes:
                     break;
             }