fix bugemmet.vim

in files with double extension type: "hola.txt.md" it generated an error
it is because you were passing a null to len() that detects if the file does not have an extension len(type)==0

autoload/emmet.vim

@@ -430,7 +430,7 @@ function! emmet#getFileType(...) abort
     endfor
   endif
 
-  return len(type) == 0 ? 'html' : type
+  return empty(type) ? 'html' : type
 endfunction
 
 function! emmet#getDollarExprs(expand) abort