Make sure getInitialState return an object with search

[abhishiv]

For fixing #372

Without this, if you navigate to same route with same pathname but different query parameters, query params don't update since this if block gets triggered due to initialstate.location being undefined.

route &&
      !action.error &&
      (typeof route === 'string' || route.path) &&
      (action.meta.location.current.pathname === state.pathname &&
        action.meta.location.current.search === state.search &&
        action.meta.location.kind !== state.kind
      )
  ) {
    return {
      ...state,
      kind: action.meta.location.kind
    }
  }

this issue happens from transitioning from http://localhost:8000/?category_id=1&page=1&sort_by=ean%3AASC to http://localhost:8000/ using NavLink from redux-first-router-link

[faceyspacey]

🎉 This PR is included in version 2.1.5 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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