```ruby
require 'geocoder/lookups/base'
require "geocoder/results/nominatim"

module Geocoder::Lookup
  class Nominatim < Base

    def map_link_url(coordinates)
      "http://nominatim.openstreetmap.org/reverse?format=html&lat=#{coordinates[0]}&lon=#{coordinates[1]}&zoom=18&addressdetails=1"
    end

    def results(query, reverse = false)
      return [] unless doc = fetch_data(query, reverse)
      if doc.kind_of?(Array)
        if doc.any?
          return doc[0]['place_id'] != "" ? doc : []
        else
          warn "Address not found or Nominatim Geocoding API error."
          return []
        end
      else
        return doc['place_id'] != "" ? doc = [] << doc : []
      end
    end

    def query_url(query, reverse = false)
      params = {
        :format => "json",
        :polygon => "1",
        :addressdetails => "1",
        #:locale => "#{Geocoder::Configuration.language}_US",
      }
      if (reverse)
        method = 'reverse'
        parts = query.split(/\s*,\s*/);
        params[:lat] = parts[0]
        params[:lon] = parts[1]
      else
        method = 'search'
        params[:q] = query
      end
      "http://nominatim.openstreetmap.org/#{method}?" + hash_to_query(params)
    end
  end
end
```

Simplify code and don't warn.
user
```ruby
require 'geocoder/lookups/base'
require "geocoder/results/nominatim"

module Geocoder::Lookup
  class Nominatim < Base

    def map_link_url(coordinates)
      "http://nominatim.openstreetmap.org/reverse?format=html&lat=#{coordinates[0]}&lon=#{coordinates[1]}&zoom=18&addressdetails=1"
    end

    def results(query, reverse = false)
      return [] unless doc = fetch_data(query, reverse)
      doc.is_a?(Array) ? doc : [doc]
    end

    def query_url(query, reverse = false)
      params = {
        :format => "json",
        :polygon => "1",
        :addressdetails => "1",
        #:locale => "#{Geocoder::Configuration.language}_US",
      }
      if (reverse)
        method = 'reverse'
        parts = query.split(/\s*,\s*/);
        params[:lat] = parts[0]
        params[:lon] = parts[1]
      else
        method = 'search'
        params[:q] = query
      end
      "http://nominatim.openstreetmap.org/#{method}?" + hash_to_query(params)
    end
  end
end
```
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