Fix empty response from matrix

https://github.com/CartoDB/dataservices-api/issues/293

server/lib/python/cartodb_services/cartodb_services/mapzen/isolines.py

@@ -105,14 +105,16 @@ class MapzenIsolines:
 
             response = self._matrix_client.one_to_many([origin] + location_estimates,  costing_model)
             costs = [None] * self.NUMBER_OF_ANGLES
+            if not response:
+                # In case the matrix client doesn't return any data
+                break
+
             for idx, c in enumerate(response['one_to_many'][0][1:]):
                 if c[cost_variable]:
                     costs[idx] = c[cost_variable]*unit_factor
                 else:
                     costs[idx] = isorange
 
-            # self._logger.debug('i = %d, costs = %s' % (i, costs))
-
             errors = [(cost - isorange) / float(isorange) for cost in costs]
             max_abs_error = max([abs(e) for e in errors])
             if max_abs_error <= self.TOLERANCE:

server/lib/python/cartodb_services/cartodb_services/mapzen/matrix_client.py

@@ -43,7 +43,7 @@ class MatrixClient:
         }
         response = requests.get(self.ONE_TO_MANY_URL, params=request_params)
 
-        if not requests.codes.ok:
+        if response.status_code != requests.codes.ok:
             self._logger.error('Error trying to get matrix distance from mapzen',
                                data={"response_status": response.status_code,
                                      "response_reason": response.reason,
@@ -52,6 +52,16 @@ class MatrixClient:
                                      "response_headers": response.headers,
                                      "locations": locations,
                                      "costing": costing})
-            raise ServiceException("Error trying to get matrix distance from mapzen", response)
+            # In case 4xx error we return empty because the error comes from
+            # the provided info by the user and we don't want to top the
+            # isolines generation
+            if response.status_code == requests.codes.bad_request:
+                return {}
+            else:
+                raise ServiceException("Error trying to get matrix distance from mapzen", response)
 
-        return response.json()
+        # response could return with empty json
+        try:
+            return response.json()
+        except:
+            return {}

server/lib/python/cartodb_services/setup.py

@@ -10,7 +10,7 @@ from setuptools import setup, find_packages
 setup(
     name='cartodb_services',
 
-    version='0.9.2',
+    version='0.9.3',
 
     description='CartoDB Services API Python Library',