No abbreviations in content causes the build to fail

[stevenvachon]

[11ty] Problem writing Eleventy templates:
[11ty] 1. Having trouble rendering liquid template ./src/content/blog/article.md (via TemplateContentRenderError)
[11ty] 2. Cannot read properties of undefined (reading 'abbreviations') (via TypeError)
[11ty] 
[11ty] Original error stack trace: TypeError: Cannot read properties of undefined (reading 'abbreviations')
[11ty]     at Array.abbr_replace (file:///Users/stevenvachon/Documents/Git/website/node_modules/markdown-it-abbr/index.mjs:62:20)