Log plain exceptions in gRPC error handler (#866)

Fixes #793

Author: Adrian Gonzalez-Martin

mlserver/grpc/utils.py

@@ -43,7 +43,10 @@ async def _inner(self, request, context):
         try:
             return await f(self, request, context)
         except MLServerError as err:
-            logger.error(err)
+            logger.exception(err)
             await context.abort(code=_grpc_status_code(err), details=str(err))
+        except Exception as err:
+            logger.exception(err)
+            await context.abort(code=grpc.StatusCode.INTERNAL, details=str(err))
 
     return _inner