"no AST change" when there are syntax errors

[andre15silva]

For example, these two will result in "no AST change" when running the CLI on them

package gumtree.spoon.diff.operations;

import com.github.gumtreediff.actions.model.Insert;

public class InsertOperation extends AdditionOperation<Insert> {
    public InsertOperation(Insert action) {
        super(action);
    }
}

package gumtree.spoon.diff.operations;

import com.github.gumtreediff.actions.model.Insert;

public class InsertOperation extends AdditionOperation<Insert> {
    public InsertOperation(Insert action) {
        super(action)
    }
}