Per #2237, ci-run-unit this change to config.tab.cc changes the initi…

…al value of yystate from 0 to 8. This has the effect of enabling an empty config file to not produce a parsing error. It can still also parse a nonempty config file. Running all of the unit tests to confirm that this has no unintended consequences.

src/basic/vx_config/config.tab.cc

@@ -1389,7 +1389,7 @@ yyparse (void)
 
   YYDPRINTF ((stderr, "Starting parse\n"));
 
-  yystate = 0;
+  yystate = 8;
   yyerrstatus = 0;
   yynerrs = 0;
   yychar = YYEMPTY; /* Cause a token to be read.  */