message: fix(protocol-designer): fix tip position bug with zero
  closes
diff: @@ -51,7 +51,8 @@ const roundValue = (value: number | string): number =>
  class TipPositionModal extends React.Component<Props, State> {
  constructor(props: Props) {
  super(props)
  - const initialValue = props.mmFromBottom
  + const initialValue =
  + props.mmFromBottom != null
  ? roundValue(props.mmFromBottom)
  : roundValue(this.getDefaultMmFromBottom())
  this.state = { value: initialValue }
  