Assert only once we know URL has changed #247
Merged
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We need this in case someone is setting the URL to nil before setting
the image directly. I.e. they have a node which has been used as a network
node or an image node but now they want it to be an image node.
They should then set the URL to nil and then set the image.
if it was used as a network node previously, this would work.
If it was previously used as an image node it would historically assert.
This addresses that.