Error after deleting a cover letter or cv

Tested on a local instance of XE 7.4.2

1. Login as Admin and Create a recruitment page for a candidate.
2. In the Candidate Application tab, upload a pdf file and save the changes.
3. Delete the attachment from the bottom page > attachment tab.
4. Reload the page and check again Candidate Application tab.

Actual result:

• The PDF viewer is not hidden and returns this error: PDF.js v1.1.3 (build: 05991e9)
  Message: Missing PDF "http://localhost:8080/xwiki/bin/download/RecruitmentApp/TEST/1.pdf".

Expected result:

• I expect to not see anymore the pdf viewer after I deleted the attachment.