Skip testing empty metadata

Author: sdeleuze

tests/tck-build-logic/src/main/groovy/org/graalvm/internal/tck/harness/MetadataLookupLogic.groovy

@@ -119,12 +119,17 @@ class MetadataLookupLogic {
             def metadataIndex = extractJsonFile(index)
 
             for (def entry in metadataIndex) {
+                List<String> coordinates = splitCoordinates((String) entry["module"])
                 List<String> testedVersions = entry["tested-versions"] as List<String>
                 if (coordinatesMatch((String) entry["module"], groupId, artifactId) && (version == null || testedVersions.contains(version))) {
                     if (version == null) { // We want all library versions, so let's add them.
-                        testedVersions.stream().forEach(t -> matchingCoordinates.add("${entry["module"]}:${t}"))
+                        testedVersions.stream()
+                                .filter(t -> metadataRoot.resolve(coordinates.get(0)).resolve(coordinates.get(1)).resolve(t).toFile().exists())
+                                .forEach(t -> matchingCoordinates.add("${entry["module"]}:${t}"))
                     } else { // We have a specific version pinned.
-                        matchingCoordinates.add("${entry["module"]}:${version}")
+                        if (metadataRoot.resolve(coordinates.get(0)).resolve(coordinates.get(1)).resolve(version).toFile().exists()) {
+                            matchingCoordinates.add("${entry["module"]}:${version}")
+                        }
                     }
                 }
             }