[ticket/12205] Do not display 0 for empty integers when show_novalue is off

PHPBB3-12205
Merge remote-tracking branch 'nickvergessen/ticket/12205' into ticket/12205-develop

* nickvergessen/ticket/12205:
  [ticket/12205] Do not display 0 for empty integers when show_novalue is off

Conflicts:
	phpBB/includes/functions_profile_fields.php
Merge pull request #2060 from nickvergessen/ticket/12205-develop

[ticket/12205-Develop] Do not display 0 for empty integers when show_novalue is off
[ticket/12194] Ensure that field_show_novalue is present

The field was not created on boards that were 3.1-dev before 3.0.11 was relesed

PHPBB3-12194
Merge pull request #2062 from nickvergessen/ticket/12194

[ticket/12194] Ensure that field_show_novalue is present