Hide the copy button when there is no content to copy (#4546)

web/app/components/workflow/panel/workflow-preview.tsx

@@ -119,8 +119,8 @@ const WorkflowPreview = () => {
                 error={workflowRunningData?.result?.error}
                 onClick={() => switchTab('DETAIL')}
               />
+              {(workflowRunningData?.result.status !== WorkflowRunningStatus.Succeeded || !workflowRunningData?.resultText) && (
                 <SimpleBtn
-                isDisabled={workflowRunningData?.result.status !== WorkflowRunningStatus.Succeeded}
                   className={cn('ml-4 mb-4 inline-flex space-x-1')}
                   onClick={() => {
                     const content = workflowRunningData?.resultText
@@ -133,6 +133,7 @@ const WorkflowPreview = () => {
                   <Clipboard className='w-3.5 h-3.5' />
                   <div>{t('common.operation.copy')}</div>
                 </SimpleBtn>
+              )}
             </>
           )}
           {currentTab === 'DETAIL' && (