Bug 134229 [smoke][regression] fail to export data as csv format
steps to reproduce: - use the attached report - preview in web viewer - export data - select data - click on OK expected behavior: - data is exported (as csv format) actual behavior: - nothing happened
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/servlet/ViewerServlet.java
* <ul>
 * <li>__report</li>
 * <li>__format</li>
 * <li>__locale</li>
 * <li>__page</li>
 * <li><i>report parameter</i></li>
 * </ul>
 * </ul>
 * <p>
 * Each URL parameter is described below. <table border=1>
 * <tr>
 * <td><b>Parameter</b></td>
 * <td><b>Description</b></td>
 * <td><b>Values</b></td>
 * <td><b>Default</b></td>
 * </tr>
 * <tr>
 * <td>__report</td>
 * <td>The path to the report document</td>
 * <td>&nbsp;</td>
 * <td>required</td>
 * </tr>
 * <tr>
 * <td>__format</td>
 * <td>The output format</td>
 * <td>html or pdf</td>
 * <td>optional, default to html</td>
 * </tr>
 * <tr>
 * <td>__locale</td>