[PATCH v2 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 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 v1:
1:  6d36f3a8df ! 1:  b813d6f2ad t6300: don't run cat-file on non-existent object
    @@ Commit message
         * skip their execution if prerequisites aren't satistified.
         * 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.
    +    Furthermore, to prevent the accidental usage of that computed
    +    expected value, BUG out on unknown object's type.
    +
         Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
     
      ## t/t6300-for-each-ref.sh ##
    @@ t/t6300-for-each-ref.sh: test_atom() {
     -		esac
     -		# Leave $expect unquoted to lose possible leading whitespaces
     -		echo $expect >expected
    ++		# for commit leg, $3 is changed there
     +		expect=$(printf '%s' "$3" | wc -c)
      		test_expect_${4:-success} $PREREQ "basic atom: $1 contents:size" '
     +			type=$(git cat-file -t "$ref") &&
     +			case $type in
     +			tag)
     +				# We cannot use $3 as it expects sanitize_pgp to run
    -+				git cat-file tag $ref >out &&
    -+				expect=$(<out tail -n +6 | wc -c) ;;
    ++				expect=$(git cat-file tag $ref | tail -n +6 | wc -c) ;;
     +			tree | blob)
     +				expect="" ;;
     +			commit)
-:  ---------- > 2:  68ee769121 t6300: check for cat-file exit status code