Merge pull request matrix-org#3735 from matrix-org/t3chguy/address_picker_dialog_tab_trap

Stop trapping tab in AddressPickerDialog

Author: t3chguy

src/components/views/dialogs/AddressPickerDialog.js

@@ -174,7 +174,7 @@ module.exports = createReactClass({
  } else {
  this._addAddressesToList([textInput]);
  }
- } else if (e.key === Key.COMMA || e.key === Key.TAB) {
+ } else if (textInput && (e.key === Key.COMMA || e.key === Key.TAB)) {
  e.stopPropagation();
  e.preventDefault();
  this._addAddressesToList([textInput]);