Fix stack empty error for an embed outside an update block

[pmachapman]

Fixes sillsdev/serval#837

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This change is 

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.69%. Comparing base (f458988) to head (243e61f).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #376      +/-   ##
==========================================
+ Coverage   72.67%   72.69%   +0.02%     
==========================================
  Files         423      423              
  Lines       36009    36014       +5     
  Branches     4965     4967       +2     
==========================================
+ Hits        26169    26180      +11     
+ Misses       8745     8741       -4     
+ Partials     1095     1093       -2     

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[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).