Bug 207250 Check blank value for datetime type parameter from url.[0002][0705]
Description: Check blank value for datetime type parameter from url. Build number:2.3.0.v20071023 Steps to reproduce: 1. New a datetime parameter mydt,listbox, tick off isRequired. 2. Preview in external browser and add "&dt=" in url, press enter. Expected result: Error message to indicate blank value isn't allowed for this parameter. Actual result: No error message and blank value is accepted. I tried to new a jsp and use <birt:paramDef> to pass the blank value and the blank value is accepted,too. Error log:n/a
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java
expr = ""; 
							
							if ( !cachedExpr.equals( expr ) )
								continue;
							
							List values = null;
							if ( parameter.isMultiValue( ) )
							{
								values = (List) this.configMap.get( paramName );
								if ( values == null )
								{
									values = new ArrayList( );
									this.configMap.put( paramName, values );
								}
							}
							
							if ( varName.toLowerCase( ).startsWith(
									ParameterAccessor.PARAM_ISNULL ) )
							{
								if ( parameter.isMultiValue( ) )
									values.add( null );
								else
									this.configMap.put( paramName, null );
							}
							
							else if ( ( displayTextParam = ParameterAccessor
									.isDisplayText( varName ) ) != null )
							{
								this.displayTexts.put( paramName, varValue );
							}