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
* The target file name
	 */
	protected String targetFile = null;
	/**
	 * execution mode, one of the Run, RunAndRender and Render. the default mode
	 * is RunAndRender
	 */
	protected String mode = "RunAndRender"; 
	/**
	 * the output locale, used in Run and RunAndRender modes.
	 */
	protected String locale = "en"; 
	/**
	 * the output format, used in Render and RunAndRender.
	 */
	protected String format = "html"; 
	/**
	 * used to decorate the HTML output, used in Render and RunAndRender mode.
	 */
	protected String htmlType = "HTML"; 
	/**
	 * the output encoding, used in html format in Render and RunAndRender
	 * modes.
	 */
	protected String encoding = "utf-8"; 
	/**
	 * paramters used to execute the report, used in Run and RunAndRender modes.
	 */
	protected HashMap params = new HashMap( ); 
	/**