Fix for 'Plugin Manager: Plugins' view showing white-space when sidebar is collapsed

Fix for 'Plugin Manager: Plugins' view showing white-space when sidebar is collapsed

Before -
![before](https://cloud.githubusercontent.com/assets/1375006/4689125/68f9feba-56a7-11e4-83c7-185b3f24c1da.png)

After patch -
![after](https://cloud.githubusercontent.com/assets/1375006/4689126/6d600ad0-56a7-11e4-9052-a4221166e99f.png)