Fix mimetype issues when maintype/subtype is empty

core/fonts/private/GetMediaType.html

@@ -11,14 +11,30 @@
   @returns String
 
 */}}
+{{ $MainType := "font" }}
 {{ $SubType := "woff2" }}
-{{/* It appears CloudFlare produces an empty string when calling .MediaType.SubType on a woff2...
+{{/* It appears CloudFlare produces an empty string when calling .MediaType.MainType or .MediaType.SubType on a woff2...
     As this is by far the best font format these days in terms of support and optimization,
     making it default to ensure it is not botched by cloudflare is "ok".
 */}}
 {{ with .MediaType.SubType }}
   {{ $SubType = . }}
 {{ end }}
-{{ $MainType := .MediaType.MainType }}
+{{ with .MediaType.MainType }}
+  {{ $MainType = . }}
+{{ end }}
+
+{{ $MediaType := "%s/%s" $MainType $SubType }}
+
+{{/* Another weirdness for some files depending on hosting plaftorm. 
+  Some woff file would return application/font-woff 
+  But Chrome will print a `<link rel=preload> has an unsupported `type` value` warning on non-font "types".
+*/}}
+{{ $irregular := dict 
+  "application/font-woff" "font/woff"
+}}
+{{ with index $irregular $format }}
+  {{ $format = . }}
+{{ end }}
 
 {{ return printf "%s/%s" $MainType $SubType }}