When packing an addon it would be great if the output files were validated. Now most errors only show when pressing publish.

Examples of errors that would be great if shown while packing

• Failed to load metafile of mission config image:
• Checking world file
  • Sound map is missing
  • Topology map is missing
  • Navmesh is missing

I'm sure there are more errors that I'm not aware of that would be great to know about when packing. In particular for CI builds.