Previously, in the projects page, when a new page was loaded, the old content stuck around. Make sure it dissapears when the loading text is visible. Similarly, in the gr-admin-group page, show the loading text and also remove results when a new page is requested. In both cases, uses css to display: none rather than the hidden attribute. Bug: Issue 6433 Change-Id: I3f8166532d39efc318a2daf1d5f5110c17fffdf6