fix: F004 exclude empty tables from recommendations
Description
In case when a table is empty (has 0 rows) its heap bloat is estimated as 100%. In some cases, such a table might be included in "F004 Recommendations" and considered as of top priority (P1). This leads to messages containing the wrong statement "can be reduced 0.00 times", for example:
table1: size 5.87 MiB, can be reduced 0.00 times, by ~5.87 MiB (~100.00%)This behavior was changed: from now on, empty tables are excluded from consideration.
CI: a new test was added to check this case automatically.
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Related issue
Edited by Nikolay Samokhvalov