Query-fix in com_content article modal

This change prevents the query from being executed when the value is 0. There is never an article with ID 0 and especially when there are more than one modal select per page, you have several unnecessary queries.
Update warnings.php

Extension Manager should not display a warning about PHP memory limit if memory_limit is set to -1
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=33230
Update default.php

Very tiny change to hide "Print"-button in prints
Fixing codestyle
Fixing codestyle
Improving Contact modal field
Improving Categories modal field
Improving Newsfeeds modal field
Code cleanup
Merge branch 'master' of github.com:Hackwar/joomla-cms into patch-1

Conflicts:
	administrator/components/com_categories/models/fields/modal/category.php
Error in featured view article dropdown
[#32730] Change in libraries/joomla/form/fields/calendar.php causing
wrong date format  (Fix #2531)
Merge pull request #3059 from toivo/patch-2

Update warnings.php
Merge pull request #3062 from eino-makitalo/staging

Update default.php
Merge pull request #3094 from infograf768/featured_dropdown

Error in featured view article dropdown
Jenkins wasn't happy with CodeStyle
Removing and adding some whitespaces
[imp][libraries] use overridable layouts for pagination
[fix][libraries] add B/C for pagination overrides done with chromes
[imp] copyright + version fixes
Adding License to punycode.js files