Handle MultiPartParserError to avoid internal sentry crash (#4001)

Handles an internal error in sentry_sdk if there is an issue with
parsing request.POST.

It would be better to handle this exception without request data instead
of crashing and not reporting anything.

---

Co-authored-by: Ivana Kellyer <[email protected]>

sentry_sdk/integrations/_wsgi_common.py

@@ -149,8 +149,15 @@ def form(self):
 
     def parsed_body(self):
         # type: () -> Optional[Dict[str, Any]]
-        form = self.form()
-        files = self.files()
+        try:
+            form = self.form()
+        except Exception:
+            form = None
+        try:
+            files = self.files()
+        except Exception:
+            files = None
+
         if form or files:
             data = {}
             if form: