make sure via stack fits at least one via

[joamatab]

fixes #1460

Thank you Marc

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 2.38%.

Quality metrics	Before	After	Change
Complexity	10.50 🙂	12.14 🙂	1.64 👎
Method Length	192.50 😞	197.67 😞	5.17 👎
Working memory	15.31 ⛔	16.17 ⛔	0.86 👎
Quality	39.03% 😞	36.65% 😞	-2.38% 👎

Other metrics	Before	After	Change
Lines	266	272	6

Changed files	Quality Before	Quality After	Quality Change
gdsfactory/components/via_stack.py	39.03% 😞	36.65% 😞	-2.38% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
gdsfactory/components/via_stack.py	via_stack	18 🙂	385 ⛔	20 ⛔	22.55% ⛔	Try splitting into smaller methods. Extract out complex expressions
gdsfactory/components/via_stack.py	via_stack_from_rules	14 🙂	386 ⛔	18 ⛔	27.16% 😞	Try splitting into smaller methods. Extract out complex expressions
gdsfactory/components/via_stack.py	optimized_via	3 ⭐	103 🙂	11 😞	63.71% 🙂	Extract out complex expressions
gdsfactory/components/via_stack.py	test_via_stack_from_rules	0 ⭐	136 😞	9 🙂	66.52% 🙂	Try splitting into smaller methods

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