Removing keywords from WFS,WMS,WCS metadata removes ALL keywords.

When removing keywords from WFS, WMS and WCS metadata, all keywords are removed regardless of whether or not any keywords were selected.

Steps to reproduce:
1) Login to Geosever and click on either the WFS, WMS, or WCS links under the Services heading.
2) Scroll down to the section labeled Current Keywords, and select one item in the list box by clicking on it with your mouse. The item you selected should now be highlighted.
3) Click the "Remove Selected" button. Notice that after the page reloads, no keywords are present within the list box.

Note: If you do not select any keyword in step #2 and simply click the "Remove Selected" button in step #3, all keywords are still removed.