[plotter] [galactica] stringify not accepted ramses params

plotter.py

@@ -206,17 +206,28 @@ class Plotter(Aggregator, BaseProcessor):
             )
 
             for param in ramses.input_parameters:
+                value = None
+                try:
+                    value = self.comp.get_nml(param.key, run)
+                except KeyError as e:
+                    self._log("key {} not found".format(e), "WARNING")
+
+                if value is not None:
                     try:
                         param_setting = ParameterSetting(
                             input_param=param,
-                        value=self.comp.get_nml(param.key, run),
+                            value=value,
+                            visibility=ParameterVisibility.BASIC_DISPLAY,
+                        )
+                        simu.parameter_settings.add(param_setting)
+
+                    except AttributeError:
+                        param_setting = ParameterSetting(
+                            input_param=param,
+                            value=str(value),
                             visibility=ParameterVisibility.BASIC_DISPLAY,
                         )
                         simu.parameter_settings.add(param_setting)
-                except KeyError as e:
-                    self._log("key {} not found".format(e), "WARNING")
-                except AttributeError as e:
-                    self._log("{}".format(e), "WARNING")
 
             self.simulations[run] = simu