Fixed UnboundLocalError #571 (#580)

spotipy/client.py

@@ -243,7 +243,8 @@ class Spotify(object):
 
             response.raise_for_status()
             results = response.json()
-        except requests.exceptions.HTTPError:
+        except requests.exceptions.HTTPError as http_error:
+            response = http_error.response
             try:
                 msg = response.json()["error"]["message"]
             except (ValueError, KeyError):
@@ -263,7 +264,8 @@ class Spotify(object):
                 reason=reason,
                 headers=response.headers,
             )
-        except requests.exceptions.RetryError:
+        except requests.exceptions.RetryError as retry_error:
+            response = retry_error.response
             logger.error('Max Retries reached')
             raise SpotifyException(
                 599,