Fix #512

[efrederickson]

Apply the fix suggested in #512

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.06%.

Quality metrics	Before	After	Change
Complexity	2.73 ⭐	2.73 ⭐	0.00
Method Length	48.29 ⭐	48.57 ⭐	0.28 👎
Working memory	4.11 ⭐	4.11 ⭐	0.00
Quality	87.31% ⭐	87.25% ⭐	-0.06% 👎

Other metrics	Before	After	Change
Lines	102	102	0

Changed files	Quality Before	Quality After	Quality Change
flask_mongoengine/json.py	87.31% ⭐	87.25% ⭐	-0.06% 👎

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

File	Function	Complexity	Length	Working Memory	Quality	Recommendation

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