Bug 153378 [Regression]Label text won't show up when the text key is not found
Steps to reproduce: 1.Add a label, set text to "aaa" 2.Add a resource file "a" to the report, add a text key "k1" which is not in the a.properties to the label 3.Preview in Web Viewer Expected result: Label display "aaa" when the text key is not found Actual result: Nothing in preview
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/util/ParameterValidationUtil.java
* <li>Percent</li>
	 * <li>Scientific</li>
	 * <li>Standard</li>
	 * <li>pattern string, such as "###,##0", "###,##0.00 'm/s'", "###.#\';';#"
	 * and so on.</li>
	 * </ul>
	 * </td>
	 * </tr>
	 * <tr>
	 * <td width="16%">Date time</td>
	 * <td width="84%">
	 * <ul>
	 * <li>General Date</li>
	 * <li>Long Date</li>
	 * <li>Medium Date</li>
	 * <li>Short Date</li>
	 * <li>Long Time</li>
	 * <li>Medium Time</li>
	 * <li>Short Time</li>
	 * <li>pattern string, such as "MM/dd/yyyy hh:mm:ss a", "yyyy-MM-dd
	 * HH:mm:ss" and so on.</li>
	 * </ul>
	 * </td>
	 * </tr>
	 * <tr>
	 * <td width="16%">String</td>
	 * <td width="84%">
	 * <ul>
	 * <li>Upper case</li>
	 * <li>Lower case</li>