Bug 201236 Issue about Allow multiple and duplicate values in Layout preview[0705]
Description: Issue about Allow multiple and duplicate values in Layout preview Build number:2.2.1.v20070827 Steps to reproduce: 1. New sample data source and dataset from CUSTOMERS. 2. New a parameter p1, listbox, dynamic, value field COUNTRY, tick on allow duplicate value, tick on allow multiple values. 3. Insert a data item to Layout, set expression as var values=""; for (i=0;i<params["p1"].value.length;i++) values=values+params["p1"].value[i]+"."; values; 4. In Layout, click Preview and select France. Expected result: Display one France. Actual result: Display several France. I tried the same action but preview in Web viewer and extenal html, the result is only one France. Error log:n/a
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/DataUtil.java
* 
	 * @param value
	 *  		the input value to validate
	 * @return the formatted string
	 */
	public static String getDisplayValue( Object value )
	{
		if ( value == null )
			return null;
		if ( value instanceof Float || value instanceof Double
				|| value instanceof BigDecimal
				|| value instanceof com.ibm.icu.math.BigDecimal )
		{
			return value.toString( );
		}
		return ParameterValidationUtil.getDisplayValue( value );
	}
	/**
	 * Try convert an object to given type Types supported:
	 * <p>
	 * <ul>
	 * <li>IScalarParameterDefn.TYPE_INTEGER</li>
	 * <li>IScalarParameterDefn.TYPE_DECIMAL</li>
	 * <li>IScalarParameterDefn.TYPE_BOOLEAN</li>
	 * <li>IScalarParameterDefn.TYPE_DATE_TIME</li>
	 * <li>IScalarParameterDefn.TYPE_FLOAT</li>
	 * <li>IScalarParameterDefn.TYPE_STRING</li>
	 * <li>IScalarParameterDefn.TYPE_DATE</li>
	 * <li>IScalarParameterDefn.TYPE_TIME</li>
	 * <ul>