Add loading indicator for proposal page, prevent 404 showing prematurely #1031
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What does this PR do?
Fixes the loading state for a proposal that isn't prebuilt by not immediately showing a 404
Steps for testing:
Load a proposal, such as
/executive/0x6D89a389C59113a9DA17f094c9b8772A97854593
and see that it shows loading state rather than a 404 while it fetches the spell data.Screenshots (if relevant):
Before:

After:
