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
String value, ULocale locale ) throws ValidationValueException
	{
		assert !StringUtil.isBlank( format );
		if ( DesignChoiceConstants.DATETIEM_FORMAT_TYPE_UNFORMATTED
				.equalsIgnoreCase( format ) )
			return doVidateDateTime( value, locale );
		if ( StringUtil.isBlank( value ) )
			return null;
		try
		{
			DateFormatter formatter = new DateFormatter( locale );
			formatter.applyPattern( format );
			return formatter.parse( value );
		}
		catch ( ParseException e )
		{
			throw new ValidationValueException( value,
					PropertyValueException.DESIGN_EXCEPTION_INVALID_VALUE,
					DesignChoiceConstants.PARAM_TYPE_DATETIME );
		}
	}
	/**
	 * Validates the input date time string with the given format.
	 * 
	 * @param dataType
	 *            the data type of the value
	 * @param format
	 *            the format pattern
	 * @param value
	 *            the value to validate