make-derivation: only modify name when name is given

This preserves Nix’s native error handling of missing name:

  error: derivation name missing

pkgs/stdenv/generic/make-derivation.nix

@@ -177,9 +177,9 @@ rec {
            "checkInputs" "installCheckInputs"
            "__impureHostDeps" "__propagatedImpureHostDeps"
            "sandboxProfile" "propagatedSandboxProfile"])
-        // (lib.optionalAttrs (!(attrs ? name))) {
+        // (lib.optionalAttrs (!(attrs ? name) && attrs ? pname && attrs ? version)) {
           name = "${attrs.pname}-${attrs.version}";
-        } // (lib.optionalAttrs (stdenv.hostPlatform != stdenv.buildPlatform && !dontAddHostSuffix)) {
+        } // (lib.optionalAttrs (stdenv.hostPlatform != stdenv.buildPlatform && !dontAddHostSuffix && (attrs ? name || (attrs ? pname && attrs ? version)))) {
           # Fixed-output derivations like source tarballs shouldn't get a host
           # suffix. But we have some weird ones with run-time deps that are
           # just used for their side-affects. Those might as well since the