NPE during Liferay startup in case of setting dl.file.entry.processors property to blank

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.2.X, Master
• Fix Version/s: 7.2.10 DXP FP4, 7.2.X, 7.2.1 CE GA2, 7.3.0 CE GA1, Master
• Component/s: DM
• Labels:
  • ee-ts
  • liferay-fixpack-dxp-4-7210
• Branch Version/s:
  7.2.x
• Backported to Branch:
  Committed
• Story Points: 1
• Fix Priority: 3
• Sprint: 036 - Clefable
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/80448

Caused by LPS-91884

Steps to reproduce

1. Configure dl.file.entry.processors to blank in portal-ext.properties
2. Start Liferay
   • Expected behavior: No NPE are thrown during startup in AudioDLPreviewRendererProviderFactory, ImageDLPreviewRendererProviderFactory or VideoDLPreviewRendererProviderFactory modules
   • Wrong behavior: NPE are thrown during startup in AudioDLPreviewRendererProviderFactory, ImageDLPreviewRendererProviderFactory and VideoDLPreviewRendererProviderFactory modules