feat(model): Check if an archive exists before trying to download it

Check if an archive exists in the storage before trying to read it in
`FileArchiver.unarchive` and `FileListResolver.resolve`.

This prevents an error message when calling `storage.getData()` and the
data does not exist.

Resolves #7041.

Signed-off-by: Martin Nonnenmacher <martin.nonnenmacher@bosch.com>

model/src/main/kotlin/utils/FileArchiver.kt

@@ -102,6 +102,11 @@ class FileArchiver(
      * Unarchive the archive corresponding to [provenance].
      */
     fun unarchive(directory: File, provenance: KnownProvenance): Boolean {
+        if (!storage.hasData(provenance)) {
+            logger.info { "Could not find archive of directory '$directory'." }
+            return false
+        }
+
         val (zipInputStream, readDuration) = measureTimedValue { storage.getData(provenance) }
 
         logger.info { "Read archive of directory '$directory' from storage in $readDuration." }

scanner/src/main/kotlin/utils/FileListResolver.kt

@@ -64,6 +64,7 @@ private fun ProvenanceFileStorage.putFileList(provenance: KnownProvenance, fileL
 }
 
 private fun ProvenanceFileStorage.getFileList(provenance: KnownProvenance): FileList? {
+    if (!hasData(provenance)) return null
     val data = getData(provenance) ?: return null
     return data.use { yamlMapper.readValue<FileList>(it) }
 }