NoMethodError: undefined method `parent.subject'

[martincizek]

When I run Redmine tests with redmine_tags installed, the error below is reported by IssuesPdfHelperTest#test_fetch_row_values_should_be_able_to_handle_parent_issue_subject.

It looks like the very issue in Redmine itself: https://www.redmine.org/issues/33103, which is already fixed. The same fix might be appropriate here too...

$ ruby test/unit/lib/redmine/export/pdf/issues_pdf_test.rb
[...]
Error:
IssuesPdfHelperTest#test_fetch_row_values_should_be_able_to_handle_parent_issue_subject:
NoMethodError: undefined method `parent.subject' for #<Issue:0x000055c70383cf28>
Did you mean?  parent_issue_id
    plugins/redmine_tags/lib/redmine_tags/patches/issues_pdf_helper_patch.rb:19:in `block in fetch_row_values_with_redmine_tags'
    plugins/redmine_tags/lib/redmine_tags/patches/issues_pdf_helper_patch.rb:14:in `collect'
    plugins/redmine_tags/lib/redmine_tags/patches/issues_pdf_helper_patch.rb:14:in `fetch_row_values_with_redmine_tags'
    test/unit/lib/redmine/export/pdf/issues_pdf_test.rb:47:in `test_fetch_row_values_should_be_able_to_handle_parent_issue_subject'

[...]