is_array() will evaluate to true even if the array is just an empty array.
Make sure we also expect an empty array passed to sql_in_set().
PHPBB3-13337
admin_activate_user.php notification type is assigning usernames to email
template variables using user_loader->get_username() in 'no_profile' mode,
which in its turn calls get_username_string() function in 'no_profile' mode.
This causes HTML markup in emails for username colour.
PHPBB3-13223
The method might now return an empty array in case of an empty users array,
too. The notification types then check if the returned array is empty and
return this if it is empty and if the notification types would otherwise
carry out other operations afterwards.
PHPBB3-12742
We run into the risc that the data is longer then the character limit
of the table column. However as we trim the users list anyway, we can
also just stop adding them and display "many others" instead of "x others"
PHPBB3-12371
* github-nickvergessen/ticket/12282:
[ticket/12282] Update new references
[ticket/12282] Update container db mock
[ticket/12282] Add new line at EOF of the interface
[ticket/12282] Use interface for type hinting
[ticket/12282] Use {@inheritDoc} for inherited methods
[ticket/12282] Add Interface for DBAL drivers
# By Joas Schilling
# Via Joas Schilling
* nickvergessen/ticket/12349:
[ticket/12349] Fix Sniffer for @license tag
[ticket/12349] Update license header in several new files
* Elsensee/ticket/7707:
[ticket/7707] Fix undefined variable: perm_from
[ticket/7707] Add comma to last entry of arrays
[ticket/7707] Remove unnecessary variables
[ticket/7707] Add get_username_string() once more
[ticket/7707] Remove unnecessary variables
[ticket/7707] Add get_username_string() where possible
* prototech/ticket/11959:
[ticket/11959] Move phpbb_generate_string_list() to functions_content.php.
[ticket/11959] Add unit tests.
[ticket/11959] Remove use of plurals and make it possible to use Oxford comma.
[ticket/11959] Rename phpbb_gen_string_list() & fix incorrect var name.
[ticket/11959] Simplify how the users are trimmed.
[ticket/11959] Add function to create a string list.
[ticket/11959] Add samples for the untrimmed strings.
[ticket/11959] List the last user with "and" instead of a comma.
[ticket/11959] Use the plurals system for the untrimmed language strings.
[ticket/11959] Fix the NOTIFICATION_QUOTE_TRIMMED text.
[ticket/11959] Use plurals for the language strings.
