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
* @param dataType
	 *            the data type of the value
	 * @param format
	 *            the format choice string
	 * @param value
	 *            the input value to validate
	 * @return the validated value if the input value is valid for the given
	 *         data type and format choice string
	 * @throws ValidationValueException
	 *             if the input value is not valid with the given data type and
	 *             format string
	 */
	static public Object validate( String dataType, String format, String value )
			throws ValidationValueException
	{
		return validate( dataType, format, value, DEFAULT_LOCALE );
	}
	/**
	 * Validates the input boolean value with the given locale.
	 * 
	 * @param value
	 *            the input value to validate
	 * @param locale
	 *            the locale information
	 * @return the <code>Boolean</code> object if the input is valid,
	 *         otherwise <code>null</code>
	 * @throws ValidationValueException
	 */
	static private Boolean doValidateBoolean( String value, ULocale locale )
			throws ValidationValueException