Lightning inspector retains previous text texture attributes when we've set the text to ''

[newmanja]

Tracked by https://www.stb.bskyb.com/jira/browse/NGAPPS-9179 on our side.

Use lightning inspector to look at an element from a Lightning app with text 'foo' in it, and see attribute texture-text='foo'. In your Lightning app change the text to '' (empty string). In inspector... it still says texture-text='foo'.

I think the underlying issue stems from the fact that changing text from 'foo' to 'bar' means attaching a new texture, and that propagates through to the inspector nicely. Changing text to '' means removing the old texture but not attaching a new one; the inspector doesn't notice.

We have a kinda-workaround, relying on the fact that the w, h drop to 0px when there's no text, but this doesn't work if an explicit width or height has been set in the app (if the width and height are not derived from the text texture dimensions).

We're using Lightning core 2.6.0.

[chiefcll]

This is from:
https://github.com/rdkcentral/Lightning/blob/master/devtools/lightning-inspect.js#L814
And then
https://github.com/rdkcentral/Lightning/blob/master/src/textures/TextTexture.mjs#L581

Since its empty it won't return.