fix: logger message

[betodealmeida]

SUMMARY

Small fix: when we try to load a DB engine spec but it fails (because of missing dependencies, for example) the logging message will also fail because engine_spec is undefined.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #20714 (ea9abad) into master (2cb4fd3) will decrease coverage by 11.63%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           master   #20714       +/-   ##
===========================================
- Coverage   66.82%   55.19%   -11.64%     
===========================================
  Files        1750     1750               
  Lines       65896    65896               
  Branches     7017     7017               
===========================================
- Hits        44035    36370     -7665     
- Misses      20075    27740     +7665     
  Partials     1786     1786               

Flag	Coverage Δ
hive	53.87% <0.00%> (ø)
postgres	?
presto	53.73% <0.00%> (ø)
python	58.71% <0.00%> (-24.25%)	⬇️
sqlite	?
unit	51.03% <0.00%> (ø)

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

Impacted Files	Coverage Δ
superset/db_engine_specs/__init__.py	84.61% <0.00%> (ø)
superset/utils/dashboard_import_export.py	0.00% <0.00%> (-100.00%)	⬇️
superset/key_value/commands/update.py	0.00% <0.00%> (-88.89%)	⬇️
superset/key_value/commands/delete.py	0.00% <0.00%> (-85.30%)	⬇️
superset/key_value/commands/delete_expired.py	0.00% <0.00%> (-80.77%)	⬇️
superset/dashboards/commands/importers/v0.py	15.62% <0.00%> (-76.25%)	⬇️
superset/datasets/commands/update.py	25.30% <0.00%> (-68.68%)	⬇️
superset/datasets/commands/create.py	29.41% <0.00%> (-68.63%)	⬇️
superset/datasets/commands/importers/v0.py	24.03% <0.00%> (-67.45%)	⬇️
superset/reports/commands/execute.py	24.45% <0.00%> (-67.16%)	⬇️
... and 276 more

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[michael-s-molina]

@betodealmeida The license error was fixed here so you just need to rebase your PR.