patch 8.2.2263: Vim9: compilation error with try-catch in skipped block

Problem:    Vim9: compilation error with try-catch in skipped block.
Solution:   Do not bail out when generate_instr() returns NULL. (closes #7584)
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index 3fbf1bc..d9aa71e 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -361,6 +361,35 @@
   endtry
   assert_equal(99, n)
 
+  var done = 'no'
+  if 0
+    try | catch | endtry
+  else
+    done = 'yes'
+  endif
+  assert_equal('yes', done)
+
+  done = 'no'
+  if 1
+    done = 'yes'
+  else
+    try | catch | endtry
+    done = 'never'
+  endif
+  assert_equal('yes', done)
+
+  if 1
+  else
+    try | catch /pat/ | endtry
+    try | catch /pat/ 
+    endtry
+    try 
+    catch /pat/ | endtry
+    try 
+    catch /pat/ 
+    endtry
+  endif
+
   try
     # string slice returns a string, not a number
     n = g:astring[3]