Fix get_optional_database_session to handle uninitialized database

- Moved RuntimeError catch to encompass get_db_session() call
- Previously only caught during import, not during execution
- Now properly yields None when database not initialized
- Fixes test_add_series_endpoint_authenticated test failure

src/server/utils/dependencies.py

@@ -165,21 +165,21 @@ async def get_optional_database_session() -> AsyncGenerator:
     """
     try:
         from src.server.database import get_db_session
+        
+        # Try to get a session - if database not initialized, this will raise RuntimeError
+        async with get_db_session() as session:
+            try:
+                yield session
+                # Auto-commit on successful completion
+                await session.commit()
+            except Exception:
+                # Auto-rollback on error
+                await session.rollback()
+                raise
     except (ImportError, RuntimeError):
-        # Database not available - yield None
+        # Database not available or not initialized - yield None
         yield None
         return
-    
-    # Use get_db_session context manager properly
-    async with get_db_session() as session:
-        try:
-            yield session
-            # Auto-commit on successful completion
-            await session.commit()
-        except Exception:
-            # Auto-rollback on error
-            await session.rollback()
-            raise
 
 
 def get_current_user(