[ExportSerialize] Add forwardDims before running export.

aidge_core/unit_tests/test_export.py

@@ -88,6 +88,7 @@ class test_export(unittest.TestCase):
         )
 
         initFiller(model)
+        model.forward_dims([[1, 32*32*3]])
 
         # Export model
         aidge_core.serialize_to_cpp(self.EXPORT_PATH, model)