only run rm if there is input

Signed-off-by: Anton-4 <[email protected]>

ci/basic_nightly_test.sh

@@ -8,7 +8,7 @@ zig version
 
 # Remove everything in this dir except the tar and ci folder.
 # We want to test like a user who would have downloaded the release, so we clean up all files from the repo checkout.
-ls | grep -v "roc_nightly.*tar\.gz"  | grep -v "^ci$" | xargs rm -rf
+ls | grep -v "roc_nightly.*tar\.gz"  | grep -v "^ci$" | xargs -r rm -rf
 
 # decompress the tar
 ls | grep "roc_nightly.*tar\.gz" | xargs tar -xzvf