Error Tracking: Support exceptions from Python's repl

In those cases `context_line` is `null` so we should relax the JSON
schema in this case.

Changelog: fixed

app/validators/json_schemas/error_tracking_event_payload.json

@@ -57,7 +57,7 @@
                           "type": "array"
                         },
                         "context_line": {
-                          "type": "string"
+                          "type": ["string", "null"]
                         },
                         "post_context": {
                           "type": "array"

spec/fixtures/error_tracking/python_event_repl.json

+{"breadcrumbs":{"values":[]},"contexts":{"runtime":{"build":"3.9.5 (default, May 12 2021, 15:36:59) \n[GCC 8.3.0]","name":"CPython","version":"3.9.5"}},"environment":"production","event_id":"","exception":{"values":[{"mechanism":null,"module":null,"stacktrace":{"frames":[{"abs_path":"/srv/autodevops/<stdin>","context_line":null,"filename":"<stdin>","function":"<module>","in_app":true,"lineno":2,"module":"__main__","post_context":[],"pre_context":[],"vars":{"__annotations__":{},"__builtins__":"<module 'builtins' (built-in)>","__doc__":"None","__loader__":"<class '_frozen_importlib.BuiltinImporter'>","__name__":"'__main__'","__package__":"None","__spec__":"None","capture_exception":"<function capture_exception at 0x7f5dbb3eb940>","e":"ZeroDivisionError('division by zero')","init":"<function _init at 0x7f5dbb3ea1f0>"}}]},"type":"ZeroDivisionError","value":"division by zero"}]},"extra":{"sys.argv":[""]},"level":"error","modules":{"appdirs":"1.4.4","apscheduler":"3.7.0","asgiref":"3.3.4","beautifulsoup4":"4.9.3","certifi":"2020.12.5","chardet":"4.0.0","django":"3.2.3","django-anymail":"1.3","django-environ":"0.4.5","django-livereload-server":"0.3.2","django-widget-tweaks":"1.4.8","fcache":"0.4.7","idna":"2.10","mmh3":"3.0.0","pip":"21.1.2","psycopg2-binary":"2.8.6","pytz":"2021.1","requests":"2.25.1","sentry-sdk":"1.5.0","setuptools":"57.0.0","six":"1.16.0","soupsieve":"2.2.1","sqlparse":"0.4.1","tornado":"6.1","tzlocal":"2.1","unleashclient":"4.2.0","urllib3":"1.26.4","uwsgi":"2.0.19.1","wheel":"0.36.2"},"platform":"python","sdk":{"integrations":["argv","atexit","dedupe","django","excepthook","logging","modules","stdlib","threading","tornado"],"name":"sentry.python","packages":[{"name":"pypi:sentry-sdk","version":"1.5.0"}],"version":"1.5.0"},"server_name":"","timestamp":"2021-11-17T14:46:20.898210Z"}

spec/lib/error_tracking/collector/payload_validator_spec.rb

@@ -3,16 +3,18 @@
 require 'spec_helper'
 
 RSpec.describe ErrorTracking::Collector::PayloadValidator do
+  let(:validator) { described_class.new }
+
   describe '#valid?' do
     RSpec.shared_examples 'valid payload' do
-      it 'returns true' do
-        expect(described_class.new.valid?(payload)).to be_truthy
+      specify do
+        expect(validator).to be_valid(payload)
       end
     end
 
     RSpec.shared_examples 'invalid payload' do
-      it 'returns false' do
-        expect(described_class.new.valid?(payload)).to be_falsey
+      specify do
+        expect(validator).not_to be_valid(payload)
       end
     end
 
@@ -28,6 +30,12 @@ RSpec.describe ErrorTracking::Collector::PayloadValidator do
       it_behaves_like 'valid payload'
     end
 
+    context 'python payload in repl' do
+      let(:payload) { Gitlab::Json.parse(fixture_file('error_tracking/python_event_repl.json')) }
+
+      it_behaves_like 'valid payload'
+    end
+
     context 'browser payload' do
       let(:payload) { Gitlab::Json.parse(fixture_file('error_tracking/browser_event.json')) }