[PATCH] riched20: Check for NULL in fnTextSrv_TxSetText and add test

[Fabian Maurer]

On Monday, January 2, 2017 11:24:31 PM CET Nikolay Sivov wrote:
> It's important to test if NULL text actually discards existing content
> or just does nothing.
Yeah, you're probably right. Thanks, I'll add checks for that.

> Maybe it's better to add a check to ME_InsertTextFromCursor?
I'm not sure if only this function needs it, or if others do, too. But I could 
move the check.