Similar results displays template error when selecting a blog on a content page

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.2.X, 7.3.0 CE GA1, 7.3.10 DXP GA1, Master
• Component/s: Web Search > Search Widgets
• Labels:
  • ee-bp
  • liferay-fixpack-dxp-4-7210
  • marketplace-portal-search-similar-results-1.0.0-7210
  • sme-must-7.2
• Branch Version/s:
  7.2.x
• Backported to Branch:
  Committed
• Story Points: 2
• Fix Priority: 4
• Epic Link: Similar Results
• Sprint: Search | S03 Sprint 8
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/81290

Steps to reproduce:

1. Add 2 blog entries
2. Create a new content page
3. Add Blogs and Similar Results widgets to the page
4. Set the Minimum Document Frequency and Minimum Term Frequency to 1 for the Similar Results widget
5. Click on one of the blogs

Expected result:
  Template errors should not be displayed. Results with no title aren't listed, where if there are no results with titles, the similar results widget would be blank.

Actual result:
  Template error is displayed.

Reproduced on:
Portal master GIT ID: b21006c7c63d