Make SmartyStreets recognize errors.

Fixes #1426.

lib/geocoder/lookups/smarty_streets.rb

@@ -57,7 +57,12 @@ def query_url_params(query)
  end
 
  def results(query)
- fetch_data(query) || []
+ doc = fetch_data(query) || []
+ if doc.is_a?(Hash) and doc.key?('status') # implies there's an error
+ return []
+ else
+ return doc
+ end
  end
  end
 end

test/fixtures/smarty_streets_10300

@@ -0,0 +1 @@
+{"input_index":0, "status":"invalid_zipcode", "reason":"Invalid ZIP Code."}

test/unit/lookups/smarty_streets_test.rb

@@ -73,6 +73,12 @@ def test_no_results
  assert_equal 0, results.length
  end
 
+ def test_invalid_zipcode_returns_no_results
+ assert_nothing_raised do
+ assert_nil Geocoder.search("10300").first
+ end
+ end
+
  def test_raises_exception_on_error_http_status
  error_statuses = {
  '400' => Geocoder::InvalidRequest,