message: allow label to be empty on power selector
diff: @@ -129,10 +129,11 @@ module.exports = createReactClass({
  render: function() {
  let picker;
  + const label = typeof this.props.label === "undefined" ? _t("Power level") : this.props.label;
  if (this.state.custom) {
  picker = (
  <Field id={`powerSelector_custom_${this.props.powerLevelKey}`} type="number"
  - label={this.props.label || _t("Power level")} max={this.props.maxValue}
  + label={label} max={this.props.maxValue}
  onBlur={this.onCustomBlur} onKeyDown={this.onCustomKeyDown} onChange={this.onCustomChange}
  value={String(this.state.customValue)} disabled={this.props.disabled} />
  );
  @@ -151,7 +152,7 @@ module.exports = createReactClass({
  picker = (
  <Field id={`powerSelector_notCustom_${this.props.powerLevelKey}`} element="select"
  - label={this.props.label || _t("Power level")} onChange={this.onSelectChange}
  + label={label} onChange={this.onSelectChange}
  value={String(this.state.selectValue)} disabled={this.props.disabled}>
  {options}
  </Field>
  