Texture Size [0/0] is causing unwrapping & baking problems

[AVGP]

Original issue: https://task.archilogic.com/issues/9279

How to reproduce: 1) open http://goo.gl/kLfWEz 2) Observe the Texture Size of the "front material", the size is [1, 1] 3) Look at the front material in the model structure. It says size [0, 0] 4) You can reproduce this by setting the texture size of a material to 0, 0. Then remove all texture, save the model and reload. now it will show (1,1) but the size reference in the model structure will be 0, 0 Result: If you bake the model, baking fails because of invalid UV coordinates.

e3d.require.js:279 Baking error in preview bake:  Error baking file: Unrecognized token nan': was expecting 'null', 'true', 'false' or NaN
 at [Source: /tmp/baking-server/tmp/bake/exported/lighting.al2.json; line: 124, column: 43]

!invalid.png! Expected result: Fallback to minimum texture size > proper uv unwrapping Todo: - Set a reasonable texture size minimum (>0) (there is a minimum in the slider but not the numeric field) - editor should read the texture size property from the structure, even if there is no tetxure. - OR: size property should be removed if all textures are removed