Avoid treating quota exception as bug exception

server/lib/python/cartodb_services/cartodb_services/tools/__init__.py

@@ -3,5 +3,5 @@ from coordinates import Coordinate
 from polyline import PolyLine
 from log import Logger, LoggerConfig
 from rate_limiter import RateLimiter
-from service_manager import ServiceManager, RateLimitExceeded
+from service_manager import ServiceManager, RateLimitExceeded, QuotaExceededException
 from legacy_service_manager import LegacyServiceManager

server/lib/python/cartodb_services/cartodb_services/tools/service_manager.py

@@ -10,6 +10,10 @@ class RateLimitExceeded(Exception):
     def __str__(self):
             return repr('Rate limit exceeded')
 
+class QuotaExceededException(Exception):
+    def __str__(self):
+            return repr('You have reached the limit of your quota')
+
 
 class ServiceManagerBase:
     """
@@ -37,7 +41,7 @@ class ServiceManagerBase:
         if rate and not self.rate_limiter.check():
             raise RateLimitExceeded()
         if quota and not self.quota_service.check_user_quota():
-            raise Exception('You have reached the limit of your quota')
+            raise QuotaExceededException()
 
     @property
     def config(self):