fix: generalize frontmatter parsing and coercing

Jacky Zhao

2024-01-28 42ee069c1cc515e6c5e595143e46c8201c6cbe3f

 quartz/plugins/transformers/ofm.ts

@@ -318,7 +318,7 @@
                }

                tag = slugTag(tag)
                if (file.data.frontmatter && !file.data.frontmatter.tags.includes(tag)) {
                if (file.data.frontmatter?.tags?.includes(tag)) {
                  file.data.frontmatter.tags.push(tag)
                }