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
*             if the input value is not valid with the given data type
	 */
	static private Object validate( String dataType, String value,
			ULocale locale ) throws ValidationValueException
	{
		if ( value == null )
			return null;
		if ( DesignChoiceConstants.PARAM_TYPE_DATETIME
				.equalsIgnoreCase( dataType ) )
			return doVidateDateTime( value, locale );
		else if ( DesignChoiceConstants.PARAM_TYPE_FLOAT
				.equalsIgnoreCase( dataType ) )
		{
			Number number = doValidateNumber( dataType, value, locale );
			if ( number == null )
				return null;
			return new Double( number.doubleValue( ) );
		}
		else if ( DesignChoiceConstants.PARAM_TYPE_DECIMAL
				.equalsIgnoreCase( dataType ) )
		{
			Number number = doValidateNumber( dataType, value, locale );
			if ( number == null )
				return null;
			return new BigDecimal( number.doubleValue( ) );
		}
		else if ( DesignChoiceConstants.PARAM_TYPE_INTEGER
				.equalsIgnoreCase( dataType ) )
		{
			Number number = doValidateNumber( dataType, value, locale );