Fix return empty array when the url for the username is invalid (#577)

* return empty array when the url for the username is invalid

* return empty array when there are errors in sprints method

app/services/github_client/user.rb

@@ -12,6 +12,7 @@ def pull_request_events
       events.flatten.select { |event| event[:type] == 'PullRequestEvent' }
     rescue URI::InvalidURIError, Faraday::ResourceNotFound => exception
       handle_exception(exception)
+      []
     end
 
     private
@@ -37,7 +38,9 @@ def retrieve_events
 
     def handle_exception(exception)
       Honeybadger.notify(exception)
-      Rails.logger.error(exception)
+      Rails.logger.error(
+        "Failed to retrieve pull request events for user #{@username}: #{exception.message}"
+      )
     end
   end
 end

app/services/jira_client/repository.rb

@@ -31,6 +31,7 @@ def sprints
       @sprints
     rescue Faraday::ResourceNotFound, Faraday::ForbiddenError => exception
       raised_exception(exception)
+      []
     end
 
     private