Support only certain fields for certain filetypes

[Lefteous]

I finally made some progress in my Summary plug-in which is currently in beta state. The available file properties are based on the filetype.. For example WMV videos the fields title and comments but not subject and category. For the get function I could return no such field or field empty. For the set function returning an error could be quite irritating for the user. Any idea how I could solve this?

[Alextp]

What's the problem to return an empty string where needed?

[Lefteous]

I just found out that "no such field" actually can be used to show that a certain file doesn't support a field _without_ showing an error message.
I hope this is the way intended by the author as the field index is not really invalid...

[ghisler(Author)]

Yes, the meaning of "no such field" is that a specific file does NOT contain that field.

[Lefteous]

Thanks for clarification