Don't display before_title and after_title if title is empty in widgets

[Xarem]

Hi

it's not necessary displaying before/after_title if $title is empty

Example:
wp-calendar don't have a title, so don't display $before_title and $after_title

Solution suggestion:
return false if filter widget_title notices that $title is empty

Thank you

[thee17]

only about 3 of the defaults had taken this into account. This patch fixes the core widgets. I did not patch or check the occurrences in TwentyEleven or Akismet.

I have updated the Codex, however there are a large number of plugins that probably use the method of not checking that was in the Codex.

[scribu]

Wait, since $title is always a string, what difference does it make if you use if ( !empty( $title ) ), instead of if ( $title ) ?

[c3mdigital]

Before title, title and after title do not display if there is no title on any of the default widgets.

if ( $title ) evaluates as false and they are not shown. Closing as invalid.