[Rpm-maint] [rpm-software-management/rpm] Allow database probing if _db_backend is not set (#1451)

[Michael Schroeder]

@mlschroe commented on this pull request.



> @@ -97,7 +98,7 @@ dbDetectBackend(rpmdb rdb)
 		rpmlog(RPMLOG_WARNING,
 			_("Converting database from %s to %s backend\n"),
 			ondisk->name, cfg->name);
-	    } else {
+	    } else if (*db_backend) {

We can use
```
if (ondisk && ondisk != cfg) {
    if (*db_backend) {
        if (rdb->db_flags & RPMDB_FLAG_REBUILD) {
        ...
```
and change the `cfg->name` to `db_backend` just for consistency. Would that be more to your taste?

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