Bug 200812 Issue when remove one separator setting in viewer.property[0002]
Description: Issue when remove one separator setting in viewer.property Build number:2.2.1.v200708220927 Steps to reproduce: 1. Deploy birt. 2. Open viewer.properties under WEB-INF folder. 3. Delete "viewer.sep.0=," line 4. Start server. 5. Preview report. 6. Export Data, select columns and select "Comma(,)", click OK. Expected result: Comma(,) isn't in the separator list. Actual result: Nothing happened after step6 and no error logs. Error log:n/a
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
public static final String PARAM_SELECTEDCOLUMNNUMBER = "SelectedColumnNumber"; 
	/**
	 * Parameter name that gives the selected column names of the export data
	 * form.
	 */
	public static final String PARAM_SELECTEDCOLUMN = "SelectedColumn"; 
	/**
	 * Context parameter name that gives the default locale of the BIRT viewer.
	 */
	public static final String INIT_PARAM_LOCALE = "BIRT_VIEWER_LOCALE"; 
	/**
	 * Context parameter name that gives the working folder of the local BIRT
	 * viewer user.
	 */
	public static final String INIT_PARAM_WORKING_DIR = "BIRT_VIEWER_WORKING_FOLDER"; 
	/**
	 * Context parameter name that gives the repository location of the image
	 * files.
	 */
	public static final String INIT_PARAM_IMAGE_DIR = "BIRT_VIEWER_IMAGE_DIR"; 
	/**
	 * Context parameter name that gives the repository location of the logging
	 * files.
	 */
	public static final String INIT_PARAM_LOG_DIR = "BIRT_VIEWER_LOG_DIR"; 
	/**
	 * Context parameter name that gives the logging level.
	 */
	public static final String INIT_PARAM_LOG_LEVEL = "BIRT_VIEWER_LOG_LEVEL"; 
	/**