Dominik Schilling 97fc82a879 Widgets: Make WP_Widget a real abstract class. ...

This removes the `die()` call from `WP_Widget::widget()` and converts it to an abstract method.
`WP_Widgets` (later renamed to `WP_Widget`) was introduced in [10764] where the minimum PHP requirement was 4.3, thus no `abstract` was available.

Props johnbillion.
Fixes #35981.
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git-svn-id: http://core.svn.wordpress.org/trunk@37391 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2016-05-12 20:23:28 +00:00

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