[postprocessor] correct bug of Nonizing pp.parts when reloading

postprocessor.py

@@ -394,12 +394,11 @@ class PostProcessor(HDF5Container):
 
         self.def_rules()
 
-    def load_data(self, points_src, loaded, filename, save):
+    def load_data(self, points_src, filename, save):
         """
         Load data from the source file in the memory.
         (Long and memory heavy)
         """
-        if not loaded:
         if os.path.exists(filename):
             hdf5 = tables.open_file(filename, mode="r")
             try:
@@ -432,9 +431,9 @@ class PostProcessor(HDF5Container):
         return data
 
     def load_parts(self):
+        if not self.parts_loaded:
             self.parts = self.load_data(
                 self._part,
-            self.parts_loaded,
                 self.parts_filename,
                 self.pp_params.process.save_parts,
             )
@@ -455,14 +454,14 @@ class PostProcessor(HDF5Container):
         Cells will be accessible trough self.cells
         (Long and memory heavy)
         """
+        if not self.cells_loaded:
             cells_src = CellsToPoints(self._amr)
             self.cells = self.load_data(
                 cells_src,
-            self.cells_loaded,
                 self.cells_filename,
                 self.pp_params.process.save_cells,
             )
-        self.parts_loaded = True
+            self.cells_loaded = True
 
     def unload_cells(self):
         """