impr: fallback when no chart data in database

ui/extends/tabs/tabOcr/tabOcr_B30.py

@@ -1,7 +1,7 @@
 import logging
 
 from arcaea_offline.database import Database
-from arcaea_offline.models import Score
+from arcaea_offline.models import Chart, Score
 from arcaea_offline_ocr.b30.chieri.v4.ocr import ChieriBotV4Ocr
 from arcaea_offline_ocr.b30.shared import B30OcrResultItem
 from PySide6.QtGui import QImage
@@ -49,4 +49,12 @@ def b30ResultToScore(_: None, qImage: QImage, result: B30OcrResultItem):
         comment="B30 OCR",
     )
 
+    if not chart:
+        chart = Chart(
+            song_id=song_id,
+            rating_class=result.rating_class,
+            title=song_id,
+            constant=0.0,
+        )
+
     return (chart, score)

ui/extends/tabs/tabOcr/tabOcr_Device.py

@@ -85,4 +85,11 @@ class ScoreConverter:
             comment=f"OCR {QFileInfo(imagePath).fileName()}",
         )
         chart = db.get_chart(score.song_id, score.rating_class)
+        if not chart:
+            chart = Chart(
+                song_id=result.song_id,
+                rating_class=result.rating_class,
+                title=result.song_id,
+                constant=0.0,
+            )
         return (chart, score)