Error during rendering DraftJS messages when block doesn't have inline content

[maxceem]

If we create a message with only one simbol > and after reload the page to make this message rendered, there would be an error:

decodeInlineStyleRanges.js?426c:30 Uncaught (in promise) TypeError: Cannot read property 'length' of undefined

[maxceem]

The root of the issue is that in code we create a block first, and after when we find inline content inside that block we set some properties of the block like text. But if there is no inline content, then such properties of the block stay unutilized which causes an error later as a block is not fully defined.

So the solution is set the default values of properties for the block as it has empty inline content. And if there is some inline content, such properties would be updated.

[maxceem]

The issue has been fixed as hotifx #3217