test without frontmatter should be ignored or still ran

[ryanleecode]

error: Uncaught (in promise) Error: Could not extract module comment from "examples/multisig/virtual2.eg.ts".
  if (!fileMatch) throw new Error(`Could not extract module comment from "${pathname}".`)
                        ^
    at parseFrontmatter (https://deno.land/x/[email protected]/frontmatter.ts:12:25)
    at https://deno.land/x/[email protected]/test.ts:63:29
    at eventLoopTick (ext:core/01_core.js:165:11)