Bug 175637 NPE when input parameter to document in ReportRunner.[0600]
Description: NPE when input parameter to document in ReportRunner. Build number:2.2.0.v200702251739-M5-rebuild Steps to reproduce: 1. Unzip birt runtime package to get ReportEngine folder. 2. Copy attached report into the folder. 3. Run command as genReport -m run -p "sample=sample" -p "Cust=200" test1.rptdesign genReport -m render -p "sample=sample" -p "Cust=200" test1.rptdocument Expected result: In the second command, document need no parameters input, so just ignore the input parameter values. Actual result: NPE is thrown out. Error log: SEVERE: exception in parsing the paramters java.lang.NullPointerException at org.eclipse.birt.report.engine.api.ReportRunner.renderReport(ReportRu nner.java:304) at org.eclipse.birt.report.engine.api.ReportRunner.execute(ReportRunner. java:157) at org.eclipse.birt.report.engine.api.ReportRunner.main(ReportRunner.jav a:117)
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/ReportRunner.java
* output page number, used in Render mode.
	 */
	protected long pageNumber = -1;
	/**
	 * engine used to execute the tasks.
	 */
	private IReportEngine engine;
	/**
	 * Constructor of ReportRunner
	 * 
	 * @param args -
	 *            application arguments
	 */
	public ReportRunner( String[] args )
	{
		this.args = (String[]) args.clone( );
	}
	/**
	 * Main function.
	 * 
	 * @param args -
	 *            application argumetns.
	 */
	public static void main( String[] args )
	{
		int result = new ReportRunner( args ).execute( );
		System.exit( result );
	}
	/**
	 * Check if the arguments are valid. If yes, continue to execuate the