Checks for isErrorOnEval before responding to evaluate requests

ptvsd/wrapper.py

@@ -777,6 +777,13 @@ class VSCodeMessageProcessor(ipcjson.SocketIO, ipcjson.IpcChannel):
         xml = untangle.parse(resp_args).xml
         xvar = xml.var
 
+        if xvar['isErrorOnEval']=='True':
+            self.send_response(
+                request,
+                result=None,
+                variablesReference=0)
+            return
+
         pyd_var = (pyd_tid, pyd_fid, 'EXPRESSION', expr)
         vsc_var = self.var_map.to_vscode(pyd_var, autogen=True)
         response = {