Fix model_local_variable command

The file SW2007_4Forum.mod returns terminate called after throwing an instance of 'DataTree::UnknownLocalVariableException'

See also https://forum.dynare.org/t/tex-output-unwanted-subscript-t/16072

changed milestone to %5.x

added bug label

changed the description

assigned to @sebastien

mentioned in commit preprocessor@7b3df21f

closed with commit caef9e26

mentioned in commit preprocessor@72a63752

mentioned in commit fc88e371

mentioned in commit preprocessor@fff9ffc5

mentioned in commit preprocessor@498342f4