Support `Traversable` values with empty columns for `batchInsert()`

[Tigrov]

Related PRs

• yiisoft/db-sqlite#295
• yiisoft/db-mysql#331
• yiisoft/db-pgsql#341
• yiisoft/db-oracle#260

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	✔️
Fixed issues	-

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.56%. Comparing base (c0951d7) to head (82e4f34). Report is 4 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #820 +/- ## ========================================= Coverage 99.56% 99.56% - Complexity 1316 1319 +3 ========================================= Files 64 64 Lines 3236 3244 +8 ========================================= + Hits 3222 3230 +8 Misses 14 14 ```

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