Unit Calculation: add spaces between operatores, remove obsolete default...

Unit Calculation: add spaces between operatores, remove obsolete default branch in switch statement.
bug fix #338

Source/DataTypes/SvgUnit.cs

@@ -166,15 +166,12 @@ namespace Svg
                             break;
                         case UnitRenderingType.Other:
                             // Calculate a percentage value of the normalized viewBox diagonal length. 
-                            if (owner.OwnerDocument != null && owner.OwnerDocument.ViewBox != null && owner.OwnerDocument.ViewBox.Width!=0 && owner.OwnerDocument.ViewBox.Height != 0)
+                            if (owner.OwnerDocument != null && owner.OwnerDocument.ViewBox != null && owner.OwnerDocument.ViewBox.Width != 0 && owner.OwnerDocument.ViewBox.Height != 0)
                             {
                                 _deviceValue = (float)(Math.Sqrt(Math.Pow(owner.OwnerDocument.ViewBox.Width, 2) + Math.Pow(owner.OwnerDocument.ViewBox.Height, 2)) / Math.Sqrt(2) * value / 100.0);
                             }
                             else _deviceValue = (float)(Math.Sqrt(Math.Pow(size.Width, 2) + Math.Pow(size.Height, 2)) / Math.Sqrt(2) * value / 100.0);
                             break;
-                        default:
-                            _deviceValue = (float)(Math.Sqrt(Math.Pow(size.Width, 2) + Math.Pow(size.Height, 2)) / Math.Sqrt(2) * value / 100.0);
-                            break;
                     }
                     break;
                 default: