1、修改基本模型中数据从json读入的逻辑，添加了判断读出数据是否为空

CFDStruct/CFDStructDataManager/CFDStructDataSolverBasicModelManager.cpp

@@ -38,18 +38,30 @@ void CFDStructDataSolverBasicModelManager::saveDataToDom(rapidjson::Document &do
 void CFDStructDataSolverBasicModelManager::readDataFromDom(rapidjson::Document &dom) {
     QVariant temp;
     jsonRead(dom, temp, {"region", 0, "flowType"});
+    if (temp != QVariant()) {
         m_FlowModel = temp.toInt();
+    }
     jsonRead(dom, temp, {"region", 0, "chimeraMesh"});
+    if (temp != QVariant()) {
         m_OverlayNetwork = temp.toInt();
+    }
     jsonRead(dom, temp, {"region", 0, "refValue", "rgas_mean"});
+    if (temp != QVariant()) {
         m_Rgasmean = temp.toDouble();
+    }
     jsonRead(dom, temp, {"region", 0, "refValue", "gamma"});
+    if (temp != QVariant()) {
         m_Gmean = temp.toDouble();
+    }
     jsonRead(dom, temp, {"region", 0, "solver", "turbModel", "RANS", "params", "Prl"});
+    if (temp != QVariant()) {
         m_Prlmean = temp.toDouble();
+    }
     jsonRead(dom, temp, {"region", 0, "solver", "turbModel", "RANS", "params", "Prt"});
+    if (temp != QVariant()) {
         m_Prtmean = temp.toDouble();
     }
+}
 
 /**
  * @param 求解器中,基本模型,流体属性关闭时的属性界面设置