patch 7.4.1136

Problem:    Wrong argument to assert_exception() causes a crash. (reported by
            Coverity)
Solution:   Check for NULL pointer.  Add a test.

src/eval.c

@@ -9278,7 +9278,8 @@ f_assert_exception(argvars, rettv)
 	assert_error(&ga);
 	ga_clear(&ga);
     }
-    else if (strstr((char *)vimvars[VV_EXCEPTION].vv_str, error) == NULL)
+    else if (error != NULL
+	    && strstr((char *)vimvars[VV_EXCEPTION].vv_str, error) == NULL)
     {
 	prepare_assert_error(&ga);
 	fill_assert_error(&ga, &argvars[1], NULL, &argvars[0],

src/testdir/test_assert.vim

@@ -18,6 +18,25 @@ func Test_assert_equal()
   call assert_equal([1, 2, 3], l)
 endfunc
 
+func Test_assert_exception()
+  try
+    nocommand
+  catch
+    call assert_exception('E492:')
+  endtry
+
+  try
+    nocommand
+  catch
+    try
+      " illegal argument, get NULL for error
+      call assert_exception([])
+    catch
+      call assert_exception('E730:')
+    endtry
+  endtry
+endfunc
+
 func Test_user_is_happy()
   smile
   sleep 300m

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1136,
 /**/
     1135,
 /**/