The "+ Component" toolbox category has no blocks in it

[lizlooney]

Steps to reproduce:

1. Create a new project.
2. In the toolbox, expand Components
3. Click on the "+ Component" category
4. There are no blocks in the category!
5. Look at the console. There is an error:

Uncaught Error: getModuleTypeForWorkspace: workspaceId not found: jl84_cd57U}S^lzqThyb
    at getModuleTypeForWorkspace (workspaces.ts:41:9)
    at BlockSvg$$module$build$src$core$block_svg.updateBlock_ (mrc_component.ts:146:24)
    at BlockSvg$$module$build$src$core$block_svg.loadExtraState (mrc_component.ts:140:10)