Fix stack empty error for an embed outside an update block

[pmachapman]

Fixes sillsdev/serval#837

---

This change is 

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.72%. Comparing base (8d924c1) to head (61cfd2c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #376      +/-   ##
==========================================
+ Coverage   72.70%   72.72%   +0.02%     
==========================================
  Files         423      423              
  Lines       36016    36021       +5     
  Branches     4966     4968       +2     
==========================================
+ Hits        26186    26197      +11     
+ Misses       8737     8733       -4     
+ Partials     1093     1091       -2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[Enkidu93]

@Enkidu93 reviewed 2 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ddaspit).

[ddaspit]

@ddaspit reviewed 2 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @pmachapman).