Unable to add / remove repositories

[kallisti5]

After ​https://git.haiku-os.org/haiku/commit/src/kits/package?id=dfbf1c8a0ac59206efcf819b420fbbb5bcf55251, it's not possible to "add repositories" to Haiku.

This is the responsible change:

diff --git a/src/kits/package/RefreshRepositoryRequest.cpp b/src/kits/package/RefreshRepositoryRequest.cpp
index 300c1e481e..da23156f9b 100644
--- a/src/kits/package/RefreshRepositoryRequest.cpp
+++ b/src/kits/package/RefreshRepositoryRequest.cpp
@@ -74,7 +74,11 @@ BRefreshRepositoryRequest::CreateInitialJobs()
 
 	BRepositoryCache repoCache;
 	BPackageRoster roster;
-	roster.GetRepositoryCache(fRepoConfig.Name(), &repoCache);
+	result = roster.GetRepositoryCache(fRepoConfig.Name(), &repoCache);
+	if (result != B_OK) {
+		delete fetchChecksumJob;
+		return result;
+	}
 
 	ValidateChecksumJob* validateChecksumJob
 		= new (std::nothrow) ValidateChecksumJob(fContext,

While the error checks in that commit are correct, it seems the functionality of creating repository caches depends on "erroring out loading the cache file"

The ReaderImpl won't create repositories if they are missing. I had a partial fix adding a WriterImpl if the Cache doesn't exist, but a KDL in the network stack killed my git tree and lost my stash data :-(