Merge pull request #15 from kurtdevos/master

Fix KeyError 'content-type'

Author: ingmferrer

microsoftgraph/client.py

@@ -618,7 +618,7 @@ def _request(self, method, url, headers=None, **kwargs):
 
     def _parse(self, response):
         status_code = response.status_code
-        if 'application/json' in response.headers['Content-Type']:
+        if 'application/json' in response.headers.get('Content-Type', ''):
             r = response.json()
         else:
             r = response.content