Update run_all.py

FESOM2_Mesh_Generation_{{cookiecutter.mesh_name}}/run_all.py

@@ -21,6 +21,7 @@ if __name__ == "__main__":
         os.makedirs("./raw_input_data")
     shutil.copyfile("{{cookiecutter.input_fpath}}", "./raw_input_data/{{cookiecutter.input_fname}}")
     shutil.copyfile("{{cookiecutter.input_fpath}}", "./raw_input_data/{{cookiecutter.input_fname}}_backup")
+    gateway_fixes = None
     if os.path.exists("fixup_gateways.yaml"):
         with open("fixup_gateways.yaml", "r") as gateway_fixes_file:
             gateway_fixes = yaml.load(gateway_fixes_file)