Bug 153412 Change parameter type will cause preview fail
Description: Change parameter type will cause preview fail Steps to reproduce: 1. New a report paramter, string, text-box, default value is abc. 2. Drag the parameter to Layout and preview. 3. Change the parameter's type to integer, list-box, add a value 1 4. Preview Expected result: No errors. Actual result: The value "abc" is invalid with the type "integer".
UI/org.eclipse.birt.report.designer.ui.preview/src/org/eclipse/birt/report/designer/ui/preview/editors/ReportPreviewFormPage.java
{
				parameterDialog.open( );
				
				
				if ( parameterDialog.getReturnCode( ) == InputParameterHtmlDialog.RETURN_CODE_BROWSER_CLOSED )
				{
					isDisplay = true;
					
					
					if ( isMissingParameter( ) )
					{
						editor.setActivePage( prePage.getId( ) );
						return false;
					}
				}
			}
		}
		else
		{
			isDisplay = true;
		}
		if ( isDisplay )
		{
			display( );
		}
		return true;
	}
	private boolean isDirtyModel( )
	{
		if ( getModel( ) != null && getModel( ) instanceof ModuleHandle )