patch 8.1.1005: test fails because t_F2 is not set

Problem:    Test fails because t_F2 is not set.
Solution:   Add try-catch.

src/testdir/test_registers.vim

@@ -151,12 +151,17 @@ endfunc
 " characters as an escape sequence.
 func Test_recording_esc_sequence()
   new
+  try
     let save_F2 = &t_F2
+  catch
+  endtry
   let t_F2 = "\<Esc>OQ"
   call feedkeys("qqiTest\<Esc>", "xt")
   call feedkeys("OQuirk\<Esc>q", "xt")
   call feedkeys("Go\<Esc>@q", "xt")
   call assert_equal(['Quirk', 'Test', 'Quirk', 'Test'], getline(1, 4))
   bwipe!
+  if exists('save_F2')
     let t_F2 = save_F2
+  endif
 endfunc

src/version.c

@@ -779,6 +779,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1005,
 /**/
     1004,
 /**/