patch 7.4.1567

Problem:    Crash in assert_fails().
Solution:   Check for NULL. (Dominique Pelle)  Add a test.

src/eval.c

@@ -9386,7 +9386,8 @@ f_assert_fails(typval_T *argvars, typval_T *rettv UNUSED)
 	char_u	buf[NUMBUFLEN];
 	char	*error = (char *)get_tv_string_buf_chk(&argvars[1], buf);
 
-	if (strstr((char *)vimvars[VV_ERRMSG].vv_str, error) == NULL)
+	if (error == NULL
+		  || strstr((char *)vimvars[VV_ERRMSG].vv_str, error) == NULL)
 	{
 	    prepare_assert_error(&ga);
 	    fill_assert_error(&ga, &argvars[2], NULL, &argvars[1],

src/testdir/test_assert.vim

@@ -62,6 +62,12 @@ func Test_compare_fail()
   endtry
 endfunc
 
+func Test_assert_fail_fails()
+  call assert_fails('xxx', {})
+  call assert_true(v:errors[0] =~ "Expected {} but got 'E731:")
+  call remove(v:errors, 0)
+endfunc
+
 
 func Test_user_is_happy()
   smile

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1567,
 /**/
     1566,
 /**/