EditProfile: prevent crash with account.source is not available

app/soapbox/features/edit-profile/index.tsx

@@ -124,7 +124,7 @@ const accountToCredentials = (account: Account): AccountCredentials => {
     discoverable: account.discoverable,
     bot: account.bot,
     display_name: account.display_name,
-    note: account.source.get('note'),
+    note: account.source.get('note', ''),
     locked: account.locked,
     fields_attributes: [...account.source.get<Iterable<AccountCredentialsField>>('fields', ImmutableList()).toJS()],
     stranger_notifications: account.getIn(['pleroma', 'notification_settings', 'block_from_strangers']) === true,