Merge pull request #30 from codeclimate/pb-fix-error-handling

Fix invocation error handling

Author: brynary

lib/cc/service/invocation/with_error_handling.rb

@@ -10,6 +10,8 @@ def call
       @invocation.call
     rescue => ex
       @logger.error(error_message(ex))
+
+      nil
     end
 
     private

test/invocation_test.rb

@@ -66,7 +66,7 @@ def test_error_handling
       i.with :error_handling, logger, "a_prefix"
     end
 
-    assert result.has_key?(:error)
+    assert_nil result
     assert_equal 1, logger.logged_errors.length
     assert_match /^Exception invoking service: \[a_prefix\]/, logger.logged_errors.first
   end
@@ -81,7 +81,7 @@ def test_multiple_middleware
       i.with :error_handling, logger
     end
 
-    assert result.has_key?(:error)
+    assert_nil result
     assert_equal 1 + 3, service.receive_count
     assert_equal 1, logger.logged_errors.length
   end