Change endpoint responses where there are marshalling, unmarshalling

or param errors to raise invalid data exception. That will cause
those responses to be handled in by errors.py, which will log
the errors.

Set most of schemas to strict mode so that marshmallow will raise
exception rather than checking for errors in return tuple from load.

Added handler to errors.py for marshmallow validation errors.

app/template_statistics/rest.py

@@ -15,7 +15,7 @@ template_statistics = Blueprint('template-statistics',
                                 __name__,
                                 url_prefix='/service/<service_id>/template-statistics')
 
-from app.errors import register_errors, InvalidData
+from app.errors import register_errors, InvalidRequest
 
 register_errors(template_statistics)
 
@@ -28,20 +28,16 @@ def get_template_statistics_for_service(service_id):
         except ValueError as e:
             error = '{} is not an integer'.format(request.args['limit_days'])
             message = {'limit_days': [error]}
-            raise InvalidData(message, status_code=400)
+            raise InvalidRequest(message, status_code=400)
     else:
         limit_days = None
     stats = dao_get_template_statistics_for_service(service_id, limit_days=limit_days)
-    data, errors = template_statistics_schema.dump(stats, many=True)
-    if errors:
-        raise InvalidData(errors, status_code=400)
+    data = template_statistics_schema.dump(stats, many=True).data
     return jsonify(data=data)
 
 
 @template_statistics.route('/<template_id>')
 def get_template_statistics_for_template_id(service_id, template_id):
     stats = dao_get_template_statistics_for_template(template_id)
-    data, errors = template_statistics_schema.dump(stats, many=True)
-    if errors:
-        raise InvalidData(errors, status_code=400)
+    data = template_statistics_schema.dump(stats, many=True).data
     return jsonify(data=data)