always do the extra filetype check clientside

upload.html

@@ -94,7 +94,6 @@ function fileinputChange () {
 		return
 	}
 
-	if (fileinput.accept == '') {
 	var filename = fileinput.files[0].name
 	var type = fileinput.files[0].type
 	var found = false
@@ -111,12 +110,11 @@ function fileinputChange () {
 		}
 	}
 	if (!found) {
+		alert("Invalid file: " + filename + "\nPlease select another file.")
 		fileinfo.textContent = ''
 		fileinput.value = ''
-			alert("Invalid file: " + filename)
 		return
 	}
-	}
 
 	fileinfo.textContent = Math.ceil(fileinput.files[0].size / 1024) + ' kB'
 }