Fix warning on non-existent table

[kamil-tekiela]

Fixes #18195

I think this bug should manifest itself in a lot more places. The codebase is not very strict when it comes to validating input data.

[codecov]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.09 ⚠️

Comparison is base (6ebbd62) 47.97% compared to head (80d7f0d) 47.88%.

Additional details and impacted files

@@             Coverage Diff              @@
##             QA_5_2   #18197      +/-   ##
============================================
- Coverage     47.97%   47.88%   -0.09%     
- Complexity    16928    16975      +47     
============================================
  Files           607      607              
  Lines         62402    72308    +9906     
============================================
+ Hits          29935    34623    +4688     
- Misses        32467    37685    +5218     

Flag	Coverage Δ
dbase-extension	47.34% <50.00%> (-0.59%)	⬇️
recode-extension	48.49% <50.00%> (+1.17%)	⬆️
unit-7.2-ubuntu-latest	48.46% <50.00%> (+1.08%)	⬆️
unit-7.3-ubuntu-latest	49.09% <50.00%> (?)
unit-7.4-ubuntu-latest	47.78% <50.00%> (?)
unit-8.0-ubuntu-latest	49.19% <50.00%> (?)
unit-8.1-ubuntu-latest	48.64% <50.00%> (?)
unit-8.2-ubuntu-latest	48.64% <50.00%> (?)

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

Impacted Files	Coverage Δ
libraries/classes/Plugins/Export/ExportXml.php	92.30% <50.00%> (-0.52%)	⬇️
libraries/classes/Charsets.php	73.01% <0.00%> (-12.99%)	⬇️
libraries/classes/Query/Generator.php	15.00% <0.00%> (-10.65%)	⬇️
libraries/classes/Utils/Gis.php	63.08% <0.00%> (-7.51%)	⬇️
libraries/classes/Types.php	90.15% <0.00%> (-5.93%)	⬇️
libraries/classes/WebAuthn/WebauthnLibServer.php	44.23% <0.00%> (-5.77%)	⬇️
libraries/classes/BrowseForeigners.php	56.11% <0.00%> (-5.38%)	⬇️
...ries/classes/Plugins/Auth/AuthenticationConfig.php	72.15% <0.00%> (-4.32%)	⬇️
libraries/classes/ErrorHandler.php	63.38% <0.00%> (-4.15%)	⬇️
...s/Controllers/Export/Template/UpdateController.php	42.85% <0.00%> (-3.30%)	⬇️
... and 319 more

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