Added Null check in case schema.options['type'][0] is undefined #14431
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Summary
In the process of creating a new document, I encountered a TypeError. Upon investigating the error stack, it revealed that the issue was related to an undefined property 'ref' during the execution of model.$set in the Mongoose library.
Upon further examination, I noticed that there was a missing null check for schema.options[typeKey][0], where typeKey is a crucial part of the schema. In my case, schema.options[typeKey][0] was undefined, leading to a subsequent error when trying to access the 'ref' property. To address this issue, I have proposed a pull request to the Mongoose repository that includes the necessary null check for schema.options[typeKey][0]. This modification ensures a smoother handling of cases where the referenced type is absent.