functionPython : when an error occurs in python code executed from c, print it and exit

Solver/functionPython.h

@@ -20,7 +20,14 @@ class functionPython : public function {
   {
     R.setAsProxy(res); 
     R.setDataCacheMap(m);
-    PyEval_CallObject(_pycallback, _pyargs);
+    PyObject *result = PyEval_CallObject(_pycallback, _pyargs);
+    if (result) {
+      Py_DECREF(result);
+    }
+    else {
+      PyErr_Print();
+      Msg::Fatal("An error occurs in the python function.");
+    }
   }
   functionPython (int nbCol, PyObject *callback, std::vector<const function*> dependencies)
     : function(nbCol), _pycallback(callback)

gmshpy/gmshCommon.i

@@ -24,7 +24,7 @@
 #endif
       std::cout<<level<<" : "<<message<<std::endl;
       if (level == "Fatal") 
-        throw;
+        Msg::Exit(1);
     }
   };
 %}