[X11] Allow empty plugin name and description during scan plugin

[X11] Allow empty plugin name and description during scan plugin
https://bugs.webkit.org/show_bug.cgi?id=103234

Patch by KwangYong Choi <ky0.choi@samsung.com> on 2012-11-27
Reviewed by Simon Hausmann.

Empty entries should be allowed when split the output string of scan plugin
because the plugin name and the description can be empty string.

* UIProcess/Plugins/qt/PluginProcessProxyQt.cpp:
(WebKit::PluginProcessProxy::scanPlugin):
* UIProcess/Plugins/unix/PluginProcessProxyUnix.cpp:
(WebKit::PluginProcessProxy::scanPlugin):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@135845 268f45cc-cd09-0410-ab3c-d52691b4dbfc