fix(kernel): preserve empty metadata filters #3278

Job	Run time
check-types (3.12)	20s
check-linting (3.10)	21s
check-types (3.14)	21s
check-linting (3.11)	16s
Unit Tests + Kernel (Python 3.10)	2m 53s
check-types (3.10)	22s
Unit Tests + Kernel (Python 3.13)	2m 41s
Unit Tests + PyArrow (Python 3.13, default deps)	2m 29s
Unit Tests + PyArrow (Python 3.14, default deps)	2m 51s
check-types (3.13)	20s
Unit Tests + Kernel (Python 3.12)	3m 4s
Unit Tests (Python 3.10, default deps)	2m 0s
Unit Tests + PyArrow (Python 3.10, default deps)	2m 30s
check-linting (3.13)	23s
check-types (3.11)	20s
Unit Tests (Python 3.12, default deps)	2m 2s
Unit Tests + PyArrow (Python 3.14, min deps)	2m 45s
Unit Tests + Kernel (Python 3.14)	3m 2s
Unit Tests + PyArrow (Python 3.12, default deps)	2m 43s
Unit Tests (Python 3.11, min deps)	2m 0s
Unit Tests + Kernel (Python 3.11)	2m 48s
check-linting (3.12)	17s
check-linting (3.14)	19s
Unit Tests + PyArrow (Python 3.10, min deps)	2m 42s
Unit Tests (Python 3.14, default deps)	2m 3s
Unit Tests (Python 3.11, default deps)	1m 57s
Unit Tests + PyArrow (Python 3.11, default deps)	2m 34s
Unit Tests + PyArrow (Python 3.11, min deps)	2m 41s
Unit Tests (Python 3.14, min deps)	1m 59s
Unit Tests (Python 3.10, min deps)	2m 0s
Unit Tests (Python 3.13, default deps)	2m 1s
	55m 4s

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