PMM-12405 Handle empty schema captured and not included in query.

[JiriCtvrtka]

PMM-12405

Link to the Feature Build: SUBMODULES-0

If this PR adds or removes or alters one or more API endpoints, please review and add or update the relevant API documents as well:

• [ ] API Docs updated

If this PR is related to some other PRs in this or other repositories, please provide links to those PRs:

• Links to related pull requests (optional).

[codecov[bot]]

Codecov Report

Merging #2405 (80466d8) into main (1cca6f9) will increase coverage by 1.08%. Report is 7 commits behind head on main. The diff coverage is 57.14%.

@@            Coverage Diff             @@
##             main    #2405      +/-   ##
==========================================
+ Coverage   41.99%   43.07%   +1.08%     
==========================================
  Files         391      387       -4     
  Lines       49099    48639     -460     
==========================================
+ Hits        20619    20953     +334     
+ Misses      26540    25714     -826     
- Partials     1940     1972      +32     

Flag	Coverage Δ
agent	53.36% <57.14%> (+3.25%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
agent/runner/actions/mysql_explain_action.go	64.51% <57.14%> (+8.81%)	:arrow_up:

... and 61 files with indirect coverage changes

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