Fix attribute error accessing response.text

The response object *should* be a requests.Response object, which *should*
have a .text property. However, there are situations where this is not the
case, and in those cases we now won't produce an AttributeError.

pillar/sdk.py

@@ -94,8 +94,9 @@ class FlaskInternalApi(pillarsdk.Api):
             return response
 
         exception = exceptions.exception_for_status(response.status_code)
+        text = getattr(response, 'text', '')
         if exception:
-            raise exception(response, response.text)
+            raise exception(response, text)
 
-        raise exceptions.ConnectionError(response, response.text,
+        raise exceptions.ConnectionError(response, text,
                                          "Unknown response code: %s" % response.status_code)