修复首页刷新线程返回时，option还未赋值成功导致报错问题

src/ThingsGateway.Gateway.Blazor/Page/HardwareInfoPage.razor.cs

@@ -64,9 +64,12 @@ public partial class HardwareInfoPage
             }
         }
     }
+
     #region CPU曲线
-    private object hardwareInfoEChartsOption;
+
+    private object hardwareInfoEChartsOption = new();
     private MECharts hardwareInfoECharts;
+
     private async Task GetHardwareInfoEChartsOption()
     {
         var hisDatas = _hardwareInfoWorker.GetHis();
@@ -130,7 +133,6 @@ public partial class HardwareInfoPage
         },
     }
             };
-
         }
         else
         {
@@ -166,12 +168,10 @@ public partial class HardwareInfoPage
     }
             };
             await hardwareInfoECharts.SetOption(option, false, false);
-
         }
 
-
         await InvokeStateHasChangedAsync();
     }
-    #endregion
 
+    #endregion CPU曲线
 }

src/ThingsGateway.Gateway.Blazor/Page/Index.razor.cs

@@ -111,10 +111,11 @@ public partial class Index
         }
     }
 
-
     #region CPU曲线
-    private object hardwareInfoEChartsOption;
+
+    private object hardwareInfoEChartsOption = new();
     private MECharts hardwareInfoECharts;
+
     private async Task GetHardwareInfoEChartsOption()
     {
         var hisDatas = _hardwareInfoWorker.GetHis();
@@ -178,7 +179,6 @@ public partial class Index
         },
     }
             };
-
         }
         else
         {
@@ -214,10 +214,10 @@ public partial class Index
     }
             };
             await hardwareInfoECharts.SetOption(option, false, false);
-
         }
     }
-    #endregion
+
+    #endregion CPU曲线
 
     private void showCollectDeviceChart()
     {