Bug 162841 [regression]Drill-through link to document containing parameters failed in html and pdf
Description: Drill-through link to document containing parameters failed in html and pdf Steps to reproduce: 1. New a report with a report parameter, don't set default value for it. 2. Preview in Web Viewer, input parameter value and save the report document to c:\ 3. New another report, insert a label, set a drill through link on the label, link to the report document. 4. Preview in web viewer, html and pdf, click the link. Expected result: Link to target report. Actual result: In html, a dialog popped up and said "a runtime error has occurred" In pdf, a dialog popped up and said that report parameter has null value. In frameset servlet, both formats are ok. I found that if I set default value for the report parameter in target report, the issue will disappear.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java
{
									String pattern = parameter.getPattern( );
									Object paramValueObj = ParameterValidationUtil
											.validate( dataType, pattern,
													(String) paramValue,
													ULocale.US );
									
									if ( DesignChoiceConstants.PARAM_TYPE_DATETIME
											.equalsIgnoreCase( dataType ) )
										paramValue = paramValueObj;
									else
										paramValue = ParameterValidationUtil
												.getDisplayValue( dataType,
														pattern, paramValueObj,
														locale );
								}
							}
							catch ( Exception err )
							{
								paramValue = configVar.getValue( );
							}
							this.configMap.put( paramName, paramValue );
						}
					}
				}
				handle.close( );
			}
		}
		catch ( Exception e )
		{