t1430: clean up broken refs/tags/shadow

diff --git a/convert.c b/convert.c
index d8b1f17e44044776a881f274e7d2e2ea9b5bbceb..f524b8d7f4daf70a610a1e00af2ae6f1c23f8f62 100644 (file)
--- a/convert.c
+++ b/convert.c
@@ -441,7 +441,7 @@ static int apply_filter(const char *path, const char *src, size_t len, int fd,
        struct async async;
        struct filter_params params;
 
-       if (!cmd)
+       if (!cmd || !*cmd)
                return 0;
 
        if (!dst)