Make wsgi app returns Internal Server Error on exception

If no protocol convert the data into a Response and if the data is an exception
it should be returned as an Internal Server Error instead of a succeed
response.
The exception can be used as description for the Internal Server Error.

issue6201
review31951002

trytond/protocols/jsonrpc.py

@@ -154,7 +154,7 @@ class JSONProtocol:
                 response['result'] = data
         else:
             if isinstance(data, Exception):
-                return InternalServerError()
+                return InternalServerError(data)
             response = data
         return Response(json.dumps(response, cls=JSONEncoder),
             content_type='application/json')

trytond/wsgi.py

@@ -6,7 +6,7 @@ import traceback
 
 from werkzeug.wrappers import Response
 from werkzeug.routing import Map, Rule
-from werkzeug.exceptions import abort, HTTPException
+from werkzeug.exceptions import abort, HTTPException, InternalServerError
 
 import wrapt
 
@@ -82,7 +82,10 @@ class TrytondWSGI(object):
                         response = cls.response(data, request)
                         break
                 else:
-                    response = Response(data)
+                    if isinstance(data, Exception):
+                        response = InternalServerError(data)
+                    else:
+                        response = Response(data)
         else:
             response = data
         # TODO custom process response