Fixes to flask error handling.

nomad/app/__init__.py

@@ -98,6 +98,9 @@ def handle(error: Exception):
     status_code = getattr(error, 'code', 500)
     if not isinstance(status_code, int):
         status_code = 500
+    if status_code < 100:
+        status_code = 500
+
     name = getattr(error, 'name', 'Internal Server Error')
     description = getattr(error, 'description', 'No description available')
     data = dict(