Make SmartyStreets recognize errors.

Fixes #1426.

Author: alexreisner

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,