Material Depth output causes a segfaults at intermediate invalid user input

[unfa]

I've crashed Material Maker multiple times today by trying to alter the Depth multiplier on the Material Output node.

I've figured out what I've done was use backspace to remove digits, wanting to insert new ones. As soon as I changed "0.5" to "0." - Material Maker segfaulted.

I guess it should sanitize the value and buffer last known working one in such cases?

[RodZill4]

Hmm must disable expressions in that node...

[RodZill4]

Not sure why it crashed, it should just fail to apply the parameter...

@unfa The last dev build should have a fix for this.