Descriptive metadata form with separators gives NPE on clicking raw XML button

[luis100]

Steps to reproduce:

1. Create a new AIP with desc. metadata of type EAD 2002
2. Edit the desc. metadata and click the see raw XML button on the top-left
3. Check error on the JS console.

NullPointerException happens on EditDescriptiveMetadata.java:394

  private boolean hasModifiedForm() {
    HashMap<String, MetadataValue> formMap = new HashMap<>();
    for (MetadataValue mv : supportedBundle.getValues()) {
      formMap.put(mv.getId(), mv);
    }
    HashMap<String, MetadataValue> bundleMap = new HashMap<>();
    for (MetadataValue mv : bundle.getValues()) {
      bundleMap.put(mv.getId(), mv);
    }
    for (Entry<String, MetadataValue> entry : formMap.entrySet()) {
      String key = entry.getKey();
      MetadataValue mvForm = entry.getValue();
      String formValue = mvForm != null ? mvForm.get("value") : "";
      MetadataValue mvBundle = bundleMap.get(key);
      String bundleValue = mvBundle != null ? bundleMap.get(key).get("value") : "";

      if (!formValue.equals(bundleValue)) // <<<< HERE
        return true;
    }
    return false;
  }

This is because formValue and bundleValue are both null.