raise warning with uncached cells

[joamatab]

fixes #1306

thank you Troy!

@tvt173

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.35%.

Quality metrics	Before	After	Change
Complexity	6.60 ⭐	6.92 ⭐	0.32 👎
Method Length	64.35 🙂	63.88 🙂	-0.47 👍
Working memory	8.00 🙂	8.05 🙂	0.05 👎
Quality	67.13% 🙂	66.78% 🙂	-0.35% 👎

Other metrics	Before	After	Change
Lines	3223	3235	12

Changed files	Quality Before	Quality After	Quality Change
gdsfactory/component.py	66.16% 🙂	65.64% 🙂	-0.52% 👎
gdsfactory/config.py	81.32% ⭐	81.20% ⭐	-0.12% 👎
gdsfactory/pdk.py	65.85% 🙂	65.75% 🙂	-0.10% 👎

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

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
gdsfactory/component.py	Component._write_library	32 😞	505 ⛔	17 ⛔	15.41% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
gdsfactory/pdk.py	Pdk._get_component	22 😞	255 ⛔	14 😞	29.14% 😞	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
gdsfactory/component.py	Component.plot_holoviews	14 🙂	475 ⛔	12 😞	33.50% 😞	Try splitting into smaller methods. Extract out complex expressions
gdsfactory/component.py	Component.add_polygon	18 🙂	282 ⛔	12 😞	33.79% 😞	Try splitting into smaller methods. Extract out complex expressions
gdsfactory/component.py	Component.remap_layers	29 😞	216 ⛔	10 😞	33.89% 😞	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions

Legend and Explanation

The emojis denote the absolute quality of the code:

• ⭐ excellent
• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

---

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Help us improve this quality report!

[codecov]

Codecov Report

Merging #1381 (8b3ea0c) into main (a18f327) will increase coverage by 0.01%.
The diff coverage is 84.21%.

@@            Coverage Diff             @@
##             main    #1381      +/-   ##
==========================================
+ Coverage   69.64%   69.65%   +0.01%     
==========================================
  Files         366      366              
  Lines       21852    21871      +19     
  Branches     3130     3134       +4     
==========================================
+ Hits        15218    15234      +16     
- Misses       5734     5736       +2     
- Partials      900      901       +1     

Impacted Files	Coverage Δ
gdsfactory/config.py	65.42% <66.66%> (+0.07%)	⬆️
gdsfactory/component.py	66.93% <90.90%> (+0.26%)	⬆️
gdsfactory/pdk.py	57.40% <100.00%> (+0.25%)	⬆️

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