patch projects with top-level shadow blocks #10177
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jwunderl
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Fixes the issue described here: https://forum.makecode.com/t/cannot-restore-from-history/30482
Blockly doesn't allow shadow blocks to have no parent. This shouldn't actually be possible in the editor but the evidence suggests otherwise! This change will simply convert those shadow blocks to normal blocks to prevent them from interrupting project loading.
Still don't know what the actual cause of this state is. I added a tick event so that we can at least figure out what blocks are causing it.