IO-2175 Category Dropdown Clear

Allow for clear and correct for Select allowClear sending undefined and convert that to null. Overload UndefinedtoNull to have an array of keys

client/src/utils/undefinedtonull.js

@@ -1,6 +1,10 @@
-export default function UndefinedToNull(obj) {
+export default function UndefinedToNull(obj, keys) {
   Object.keys(obj).forEach((key) => {
+    if (keys && keys.indexOf(key) >= 0) {
+        if (obj[key] === undefined) obj[key] = null;
+    } else {
     if (obj[key] === undefined) obj[key] = null;
+    }
   });
   return obj;
 }