refactor: metadata extraction (#12359)

server/src/repositories/metadata.repository.ts

@@ -36,11 +36,11 @@ export class MetadataRepository implements IMetadataRepository {
     await this.exiftool.end();
   }
 
-  readTags(path: string): Promise<ImmichTags | null> {
+  readTags(path: string): Promise<ImmichTags> {
     return this.exiftool.read(path).catch((error) => {
       this.logger.warn(`Error reading exif data (${path}): ${error}`, error?.stack);
-      return null;
-    }) as Promise<ImmichTags | null>;
+      return {};
+    }) as Promise<ImmichTags>;
   }
 
   extractBinaryTag(path: string, tagName: string): Promise<Buffer> {