Umbraco-cms: Save media type crashes

[buttermilklemon]

We found an error when saving the media type. When we try to save a media type, we get an error message "System.NullReferenceException: Object reference not set to an instance of an object".
This also happens with media types that have not been changed.

Reproduction

• Get fresh umbraco installation 8.1
• Go to media types section
• Save file shows error

[kjac]

Hi @buttermilklemon, thanks for reporting. This looks like a duplicate of #5894?

[MarcStoecker]

Hey @kjac it looks like it is, but this also occures even if you don't change a thing. Just open the mediatype definition and click save. Does your PR account for this?

[kjac]

I do believe it does 😀

[MarcStoecker]

I was unable to build with your fix, so I couldn't test (not blaming you, but my inability!) 😬 Hence the stupid question. 😉

[Shazwazza]

will close as a duplicate