fix: ensure scam list loading handles missing or empty files gracefully

Author: SagarBiswas-MultiHAT

phoneint/data/scam_list.json

@@ -23,4 +23,4 @@
     "last_seen": "2024-03-10",
     "notes": "Example entry for tests and demos. Replace with your own lawful dataset."
   }
-]
+]

phoneint/gui.py

@@ -35,7 +35,7 @@
 
 def run_gui(settings: PhoneintSettings) -> None:
     try:
-        from PySide6.QtCore import QEvent, QTimer
+        from PySide6.QtCore import QEvent, QTimer, Qt
         from PySide6.QtGui import QGuiApplication
         from PySide6.QtWidgets import (
             QApplication,

phoneint/reputation/public.py

@@ -57,16 +57,19 @@ def _parse_entry(obj: dict[str, object]) -> ScamEntry:
 
 
 def load_scam_list(path: Path | None = None) -> list[ScamEntry]:
-    """
-    Load scam-list entries.
-
-    Args:
-        path: Optional JSON path. If omitted, loads the packaged sample dataset.
-    """
+    """Load scam-list entries, defaulting to the packaged sample dataset."""
 
+    data: str | None = None
     if path is not None:
-        data = path.read_text(encoding="utf-8")
-    else:
+        try:
+            if path.exists():
+                raw_text = path.read_text(encoding="utf-8")
+                if raw_text.strip():
+                    data = raw_text
+        except OSError:
+            data = None
+
+    if data is None:
         data = (
             resources.files("phoneint.data").joinpath("scam_list.json").read_text(encoding="utf-8")
         )