maybe_single with no matching rows returns None

[anand2312]

What kind of change does this PR introduce?

Bug fix - closes #230 . The maybe_single method now returns None when the query returns 0 rows.

What is the current behavior?

maybe_single errors out on responses with 0 rows, while trying to create a SingleAPIResponse with it's data field set to None, which pydantic rejects.

[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.46%.

Quality metrics	Before	After	Change
Complexity	1.84 ⭐	1.84 ⭐	0.00
Method Length	52.97 ⭐	52.42 ⭐	-0.55 👍
Working memory	7.44 🙂	7.33 🙂	-0.11 👍
Quality	78.78% ⭐	79.24% ⭐	0.46% 👍

Other metrics	Before	After	Change
Lines	668	656	-12

Changed files	Quality Before	Quality After	Quality Change
postgrest/_async/request_builder.py	78.76% ⭐	79.22% ⭐	0.46% 👍
postgrest/_sync/request_builder.py	78.80% ⭐	79.26% ⭐	0.46% 👍

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

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
postgrest/_async/request_builder.py	AsyncSelectRequestBuilder.text_search	4 ⭐	116 🙂	10 😞	62.91% 🙂	Extract out complex expressions
postgrest/_sync/request_builder.py	SyncSelectRequestBuilder.text_search	4 ⭐	116 🙂	10 😞	62.91% 🙂	Extract out complex expressions
postgrest/_async/request_builder.py	AsyncRequestBuilder.upsert	0 ⭐	60 ⭐	13 😞	69.70% 🙂	Extract out complex expressions
postgrest/_sync/request_builder.py	SyncRequestBuilder.upsert	0 ⭐	60 ⭐	13 😞	69.70% 🙂	Extract out complex expressions
postgrest/_async/request_builder.py	AsyncRequestBuilder.insert	0 ⭐	54 ⭐	11 😞	73.95% 🙂	Extract out complex expressions

Legend and Explanation

The emojis denote the absolute quality of the code:

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• 🙂 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

Patch coverage: 50.00% and no project coverage change

Comparison is base (67572ba) 91.51% compared to head (849f306) 91.51%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #231   +/-   ##
=======================================
  Coverage   91.51%   91.51%           
=======================================
  Files          24       24           
  Lines        1167     1167           
=======================================
  Hits         1068     1068           
  Misses         99       99           

Impacted Files	Coverage Δ
postgrest/_async/request_builder.py	79.61% <50.00%> (ø)
postgrest/_sync/request_builder.py	86.40% <50.00%> (ø)

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