CRM-21395 port https://github.com/dompdf/dompdf/pull/1570/files using…

[seamuslee001]

… patch files to civicrm dompdf to fix no-block-level error found

Overview

Further information can be found on this State Exchange post https://civicrm.stackexchange.com/questions/21139/error-no-block-level-parent-found-not-good

Before

Invoice wasn't produced

After

invoice is now produced

ping @monishdeb @eileenmcnaughton @KarinG @adixon

[KarinG]

Confirming that this patch fixes the PDF generation (specifically Print Invoice button) -> in 4.7.27

[eileenmcnaughton]

Merging based on Karin's review. Seems safe/limited & this is a backport only

[mattwire]

@seamuslee001 @eileenmcnaughton Problem with this is that it breaks composer update on every subsequent run as patch returns non-zero if patch is already applied. Can we add something like:
if [[ $? -eq 1 ]]; then exit 0; fi
to the end of the script please?

[seamuslee001]

Thanks @mattwire I've got a plan