patch 7.4.950
Problem:    v:errors is not initialized.
Solution:   Initialze it to an empty list. (Thinca)
diff --git a/src/eval.c b/src/eval.c
index 7ec7364..2d6c34b 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -900,6 +900,7 @@
     set_vim_var_nr(VV_SEARCHFORWARD, 1L);
     set_vim_var_nr(VV_HLSEARCH, 1L);
     set_vim_var_dict(VV_COMPLETED_ITEM, dict_alloc());
+    set_vim_var_list(VV_ERRORS, list_alloc());
     set_reg_var(0);  /* default for v:register is not 0 but '"' */
 
 #ifdef EBCDIC