"Generating preview" message displays even when there is no file entry

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.0.0 DXP FP58, 7.0.0 DXP SP9, 7.0.X, 7.1.10 DXP FP1, 7.1.1 CE GA2, 7.1.10.1 SP1, 7.1.X, Master
• Component/s: DM
• Labels:
  • ee-ts
  • liferay-dxp-70-sp9
  • liferay-dxp-71-sp1
  • liferay-fixpack-de-58-7010
  • liferay-fixpack-dxp-1-7110
• Branch Version/s:
  7.1.x, 7.0.x
• Backported to Branch:
  Committed
• Story Points: 0.25
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/62092

Steps to Reproduce:

1. Navigate to Content -> Documents and Media
2. Add a new Basic Document
3. Create a non-file titled "nofile.jpg" with no file attached; then Publish
4. Click on the title/link of the new document which will display its preview window

Expected Results:
Preview is not generated (with possible information message that states the file can't be previewed)

Actual Results:
Preview is not generated but a message will appear that will never go away: "Generating preview will take a few minutes."