fix add main component error

Runtime/Coord/Polar/PolarCoord.cs

@@ -11,7 +11,6 @@ namespace XCharts.Runtime
     /// </summary>
     [Serializable]
     [ComponentHandler(typeof(PolarCoordHandler), true)]
-    [RequireChartComponent(typeof(AngleAxis), typeof(RadiusAxis))]
     public class PolarCoord : CoordSystem, ISerieContainer
     {
         [SerializeField] private bool m_Show = true;
@@ -32,8 +31,8 @@ namespace XCharts.Runtime
             set { if (PropertyUtil.SetStruct(ref m_Show, value)) SetVerticesDirty(); }
         }
         /// <summary>
-        /// [default:[0.5f,0.45f]]The center of ploar. The center[0] is the x-coordinate, and the center[1] is the y-coordinate.
-        /// |When value between 0 and 1 represents a percentage  relative to the chart.
+        /// The center of ploar. The center[0] is the x-coordinate, and the center[1] is the y-coordinate.
+        /// When value between 0 and 1 represents a percentage  relative to the chart.
         /// |极坐标的中心点。数组的第一项是横坐标，第二项是纵坐标。
         /// 当值为0-1之间时表示百分比，设置成百分比时第一项是相对于容器宽度，第二项是相对于容器高度。
         /// </summary>
@@ -43,7 +42,7 @@ namespace XCharts.Runtime
             set { if (value != null) { m_Center = value; SetAllDirty(); } }
         }
         /// <summary>
-        /// [default:0.35f]the radius of polar.
+        /// the radius of polar.
         /// |极坐标的半径。
         /// </summary>
         public float radius
@@ -52,7 +51,7 @@ namespace XCharts.Runtime
             set { if (PropertyUtil.SetStruct(ref m_Radius, value)) SetAllDirty(); }
         }
         /// <summary>
-        /// [default:Color.clear]Background color of polar, which is transparent by default.
+        /// Background color of polar, which is transparent by default.
         /// |极坐标的背景色，默认透明。
         /// </summary>
         public Color backgroundColor