Make null checks work with undefined variables

Author: c-w

app/server/static/components/annotationMixin.js

@@ -122,7 +122,7 @@ export default {
     },
 
     replaceNull(shortcut) {
-      if (shortcut === null) {
+      if (shortcut == null) {
         shortcut = '';
       }
       shortcut = shortcut.split(' ');

app/server/static/components/filter.js

@@ -1,5 +1,5 @@
 export function simpleShortcut(shortcut) {
-  let simplified = shortcut === null ? '' : shortcut;
+  let simplified = shortcut == null ? '' : shortcut;
   simplified = simplified.replace('ctrl', 'C');
   simplified = simplified.replace('shift', 'S');
   simplified = simplified.split(' ').join('-');