fixes #1544

There may be a shorter way to do this?

app/assets/javascripts/notes.js

@@ -434,7 +434,12 @@ Danbooru.Note = {
       var offset = $("#image").offset();
       
       if (dragged) {
-        if(w > 9 && h > 9) { /* minimum note size: 10px */
+        if (w > 9 || h > 9) { /* minimum note size: 10px */
+          if (w <= 9) {
+            w = 10;
+          } else if (h <= 9) {
+            h = 10;
+          }
           Danbooru.Note.new(x - offset.left, y - offset.top, w, h);
         }
       } else {