Our blocks should not assume they are Blockly.BlockSvg #297
Description
In a headless workspace, blocks are just Blockly.Block, not Blockly.BlockSvg.
You can tell whether a block is a Blockly.BlockSvg with block.rendered.
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In a headless workspace, blocks are just Blockly.Block, not Blockly.BlockSvg.
You can tell whether a block is a Blockly.BlockSvg with block.rendered.