No handler for RUN_BLOCK was registered in the receiving end

[twschiller]

Bug introduced in 1.4.4? Introduced sometime between 1.4.2, 1.4.3, or 1.4.4

Steps to reproduce:

Use a blueprint with:

1. Use open a tab to open a new tab that contains a form
2. Submit a form on the page (using window: target)
3. Wait for an element on the next page (using window: target)

Related

• executeInTarget fails early due to intermediate content script state #1585: we fixed the bug during 1.4.1, but it looks like it's back
• Error handling context menu action: No handlers registered in receiving end #1724: not sure if this is related?

[fregante]

• executeInTarget fails early due to intermediate content script state #1585: we fixed the bug during 1.4.1, but it looks like it's back

I changed the error message in the messenger after that PR, so if it's the same exact error then we just need to update NOT_READY_PARTIAL_MESSAGES