Generating preview message is misleading when it appears for encrypted PDFs

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, 7.1.X, Master
• Fix Version/s: 7.1.10 DXP FP9, 7.1.10.2 SP2, 7.1.3 CE GA4, 7.1.X, Master
• Component/s: DM > Administration
• Labels:
  • ee-ts
  • liferay-dxp-71-sp2
  • liferay-fixpack-dxp-9-7110
  • no_predic
  • pt-app-security-review
• Branch Version/s:
  7.1.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/67708

Steps to Reproduce:

1) Startup Liferay
2) Navigate to Documents and Media
3) Upload an encrypted PDF
4) Add a Documents and Media Display Portlet on a Page
5) Click the PDF

Expected Behavior: No error message indicating that a preview is being generated would show. User should be alerted that a preview could not be generated.
Actual Behavior: Generating preview message ("Generating preview will take a few minutes.") is shown