If JSON fails to parse show the body of the response.

check.py

@@ -7,6 +7,7 @@ import smtplib
 import sys
 
 import requests
+import simplejson.errors
 
 MAIL_FROM = "edward@4angle.com"
 MAIL_TO = "edward@4angle.com"
@@ -35,7 +36,11 @@ def send_mail(subject: str, body: str) -> None:
 def check_for_paris_events() -> None:
     """Check for upcoming OSM events in Paris and send an email if found."""
     r = requests.get(URL)
+    try:
         events = r.json()
+    except simplejson.errors.JSONDecodeError:
+        print(r.text)
+        raise
 
     paris_events = [
         event for event in events if "paris" in event["location"]["detailed"].lower()