fix: [code-1663]: add error message on submit btn (#1136)

web/src/components/MarkdownEditorWithPreview/MarkdownEditorWithPreview.tsx

@@ -478,8 +478,12 @@ export function MarkdownEditorWithPreview({
               variation={ButtonVariation.PRIMARY}
               disabled={false}
               onClick={() => {
-                handleUpload(file as File, setMarkdownContent, repoMetadata, showError, standalone, routingId)
-                setOpen(false)
+                if (file !== undefined) {
+                  handleUpload(file as File, setMarkdownContent, repoMetadata, showError, standalone, routingId)
+                  setOpen(false)
+                } else {
+                  showError(getString('uploadAFileError'))
+                }
               }}
             />
             <Button

web/src/framework/strings/stringTypes.ts

@@ -852,6 +852,7 @@ export interface StringsMap {
   updateUser: string
   updateWebhook: string
   updated: string
+  uploadAFileError: string
   user: string
   userCreated: string
   userId: string

web/src/i18n/strings.en.yaml

@@ -1002,3 +1002,4 @@ summary: Summary
 prGenSummary: Have Harness AIDA summarize the code changes in this pull request
 aidaGenSummary: '[AIDA is generating a summary...]'
 importFailed: Import Failed
+uploadAFileError: There is no image or video uploaded. Please upload an image or video.