Default Sub-Issue Template - Creating a Sub-Issue from Existing Issue Via Checkbox Bypasses blank_issues_enabled: false in config.yml

[JackEAllen]

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When creating a sub-issue from an existing issue that has a checkbox via checkbox > hamburger menu > "Convert to sub-issue", the sub-issue bypasses the rule: blank_issues_enabled: false in .github/ISSUE_TEMPLATE/config.yml allowing for an empty sub-issue to be created. It would be nice if this rule was not bypassed and either the parent issue template is used or a new sub-issue template can be used by default which could be set by creating an issue template with a specific name such as "sub-issue"

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