add: error appropriately on repository with no commits

diff --git a/t/t7800-difftool.sh b/t/t7800-difftool.sh
index 668bbee73c8dc58c6ba61c4a8002ed68206d1445..22b9199d599284e9fcf5d7451b98db7ee99fffbe 100755 (executable)
--- a/t/t7800-difftool.sh
+++ b/t/t7800-difftool.sh
@@ -332,7 +332,7 @@ test_expect_success 'difftool --extcmd cat arg1' '
 test_expect_success 'difftool --extcmd cat arg2' '
        echo branch >expect &&
        git difftool --no-prompt \
-               --extcmd sh\ -c\ \"cat\ \$2\" branch >actual &&
+               --extcmd sh\ -c\ \"cat\ \\\"\$2\\\"\" branch >actual &&
        test_cmp expect actual
 '
 
@@ -557,7 +557,7 @@ test_expect_success SYMLINKS 'difftool --dir-diff --symlink without unstaged cha
        EOF
        git difftool --dir-diff --symlink \
                --extcmd "./.git/CHECK_SYMLINKS" branch HEAD &&
-       test_cmp actual expect
+       test_cmp expect actual
 '
 
 write_script modify-right-file <<\EOF