patch 8.2.0501: Vim9: script test fails when channel feature is missing

Problem:    Vim9: script test fails when channel feature is missing.
Solution:   Add a has() condition.
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index c5405a2..8d36c81 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -164,11 +164,13 @@
   let thedict: dict<any>
   assert_equal({}, thedict)
 
-  let thejob: job
-  assert_equal(test_null_job(), thejob)
+  if has('channel')
+    let thejob: job
+    assert_equal(test_null_job(), thejob)
 
-  let thechannel: channel
-  assert_equal(test_null_channel(), thechannel)
+    let thechannel: channel
+    assert_equal(test_null_channel(), thechannel)
+  endif
 enddef
 
 func Test_assignment_failure()
diff --git a/src/version.c b/src/version.c
index bb11730..b1a10aa 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    501,
+/**/
     500,
 /**/
     499,