Replace Base::Exception with appropriate subclass

src/Mod/Import/App/FeatureImportIges.cpp

@@ -85,7 +85,7 @@ Standard_Integer FeatureImportIges::Execute(void)
 
     // read iges-file
     if (aReader.ReadFile((const Standard_CString)FileName.c_str()) != IFSelect_RetDone)
-      throw Base::Exception("IGES read failed (load file)");
+      throw Base::FileException("IGES read failed (load file)");
   
     // check iges-file (memory)
     //if (!aReader.Check(Standard_True))

src/Mod/Import/App/StepShape.cpp

@@ -58,11 +58,11 @@ int StepShape::read(const char* fileName)
     if (!fi.exists()) {
         std::stringstream str;
         str << "File '" << fileName << "' does not exist!";
-        throw Base::Exception(str.str().c_str());
+        throw Base::FileException(str.str().c_str());
     }
 
     if (aReader.ReadFile((Standard_CString)fileName) != IFSelect_RetDone) {
-        throw Base::Exception("Cannot open STEP file");
+        throw Base::FileException("Cannot open STEP file");
     }
 
     //Standard_Integer ic = Interface_Static::IVal("read.precision.mode"); 

src/Mod/MeshPart/App/Mesher.cpp

@@ -317,7 +317,7 @@ Mesh::MeshObject* Mesher::createMesh() const
     }
 
 #ifndef HAVE_SMESH
-    throw Base::Exception("SMESH is not available on this platform");
+    throw Base::RuntimeError("SMESH is not available on this platform");
 #else
     std::list<SMESH_Hypothesis*> hypoth;