Add testfile for undefined usercomment

See #37

Author: bep

gen/testdata_exiftool/images/undef-usercomment.jpg.json

@@ -0,0 +1,33 @@
+[{
+  "SourceFile": "../testdata/images/undef-usercomment.jpg",
+  "ExifTool": {
+    "ExifToolVersion": 12.76
+  },
+  "File": {
+    "FileName": "undef-usercomment.jpg",
+    "Directory": "../testdata/images",
+    "FileSize": 683,
+    "FilePermissions": 100644,
+    "FileType": "JPEG",
+    "FileTypeExtension": "JPG",
+    "MIMEType": "image/jpeg",
+    "ExifByteOrder": "MM",
+    "ImageWidth": 16,
+    "ImageHeight": 16,
+    "EncodingProcess": 2,
+    "BitsPerSample": 8,
+    "ColorComponents": 3,
+    "YCbCrSubSampling": "2 2"
+  },
+  "EXIF": {
+    "XResolution": 72,
+    "YResolution": 72,
+    "ResolutionUnit": 2,
+    "YCbCrPositioning": 1,
+    "ExifVersion": "0232",
+    "ComponentsConfiguration": "1 2 3 0",
+    "UserComment": "äöüß",
+    "FlashpixVersion": "0100",
+    "ColorSpace": 65535
+  }
+}]