fix(ui): konva logging

[psychedelicious]

Summary

• Do not attempt to cache nodes without width or height. Prevents a console error from being logged by Konva. This particular error wasn't ever raised - just logged. So this only reduces some noise.
• Log at error level when an image fails to load. Previously, this log was accidentally done without specifying a log level, which apparently results in no logs at all.
• Include the specific error when an image fails to load. Previously, only a message "unable to load image" was logged.

Related Issues / Discussions

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QA Instructions

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Merge Plan

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Checklist

• The PR has a short but descriptive title, suitable for a changelog
• Tests added / updated (if applicable)
• Documentation added / updated (if applicable)
• Updated What's New copy (if doing a release after this PR)