Fix KeyError when API response missing 'list' or 'since' keys

- Replace dict access with .get() method to handle missing keys gracefully
- Add comprehensive tests for both missing 'list' and 'since' key scenarios
- Prevents crashes when Pocket API returns unexpected response format

Fixes the stack trace:
KeyError: 'list' at utils.py line 119

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: digithree

pocket_to_sqlite/utils.py

@@ -116,8 +116,8 @@ def __iter__(self):
                 retries = 0
             response.raise_for_status()
             page = response.json()
-            items = list((page["list"] or {}).values())
-            next_since = page["since"]
+            items = list((page.get("list") or {}).values())
+            next_since = page.get("since")
             if self.record_since and next_since:
                 self.record_since(next_since)
             if not items:

tests/test_save_pocket.py

@@ -72,3 +72,51 @@ def test_authors(converted):
             "url": "http://people.idsia.ch/~juergen/heatexchanger/heatexchanger.html",
         }
     ] == authors
+
+
+def test_fetch_items_handles_missing_list_key():
+    """Test that FetchItems handles API responses missing the 'list' key gracefully."""
+    from unittest.mock import Mock, patch
+    
+    # Mock auth
+    auth = {
+        "pocket_consumer_key": "test_key",
+        "pocket_access_token": "test_token"
+    }
+    
+    # Mock response without 'list' key
+    mock_response = Mock()
+    mock_response.status_code = 200
+    mock_response.json.return_value = {"since": 1234567890}  # Missing 'list' key
+    mock_response.raise_for_status.return_value = None
+    
+    with patch('requests.get', return_value=mock_response):
+        fetcher = utils.FetchItems(auth, page_size=1)
+        items = list(fetcher)
+        
+        # Should return empty list instead of raising KeyError
+        assert items == []
+
+
+def test_fetch_items_handles_missing_since_key():
+    """Test that FetchItems handles API responses missing the 'since' key gracefully."""
+    from unittest.mock import Mock, patch
+    
+    # Mock auth
+    auth = {
+        "pocket_consumer_key": "test_key",
+        "pocket_access_token": "test_token"
+    }
+    
+    # Mock response without 'since' key
+    mock_response = Mock()
+    mock_response.status_code = 200
+    mock_response.json.return_value = {"list": {}}  # Missing 'since' key
+    mock_response.raise_for_status.return_value = None
+    
+    with patch('requests.get', return_value=mock_response):
+        fetcher = utils.FetchItems(auth, page_size=1)
+        items = list(fetcher)
+        
+        # Should handle missing 'since' key gracefully
+        assert items == []