[PATCH v3 0/2] t6300: clear warning when running without gpg

Running t6300 in an environment without gpg(1), we'll see those warnings:

	fatal: Not a valid object name refs/tags/signed-empty
	fatal: Not a valid object name refs/tags/signed-short
	fatal: Not a valid object name refs/tags/signed-long

Because, those objects will be created only when GPG is satistified. This series try to clean those errors.

Change in v3 from v2:
* Fix grammar in 1/2 commit's message
* Let tail open input file instead of using shell redirection.

Change in v2 from v1:
* Make 1/2 as near pure-code-move; and
* Use 2/2 as a code change to preserve status code for cat-file
* Mention reasons that 1/2 couldn't be pure-code-move.

Đoàn Trần Công Danh (2):
  t6300: don't run cat-file on non-existent object
  t6300: check for cat-file exit status code

 t/t6300-for-each-ref.sh | 29 ++++++++++++++++++-----------
 1 file changed, 18 insertions(+), 11 deletions(-)

Range-diff against v2:
1:  b813d6f2ad ! 1:  b1b9771913 t6300: don't run cat-file on non-existent object
    @@ Commit message
     
         In t6300, some tests are guarded behind some prerequisites.
         Thus, objects created by those tests ain't available if those
    -    prerequisites is unsatistified.  Attempting to run "cat-file"
    +    prerequisites are unsatistified.  Attempting to run "cat-file"
         on those objects will run into failure.
     
         In fact, running t6300 in an environment without gpg(1),
    @@ Commit message
         * check their exit status code
     
         The expected value for objects with type: commit needs to be
    -    computed outside the test because we can't relies on "$3" there.
    +    computed outside the test because we can't rely on "$3" there.
         Furthermore, to prevent the accidental usage of that computed
         expected value, BUG out on unknown object's type.
     
2:  68ee769121 ! 2:  83d532528b t6300: check for cat-file exit status code
    @@ t/t6300-for-each-ref.sh: test_atom() {
      				# We cannot use $3 as it expects sanitize_pgp to run
     -				expect=$(git cat-file tag $ref | tail -n +6 | wc -c) ;;
     +				git cat-file tag $ref >out &&
    -+				expect=$(tail -n +6 <out | wc -c) &&
    ++				expect=$(tail -n +6 out | wc -c) &&
     +				rm -f out ;;
      			tree | blob)
      				expect="" ;;