Update app.py

app.py

@@ -41,7 +41,7 @@ CANDIDATES = [
 ]
 
 @app.get("/search_candidates")
-def search_candidates(role: str, industry: str, location: str):
+def search_candidates(role: str | None = None, industry: str | None = None, location: str | None = None):
     # Filter logic
     matches = [
         c for c in CANDIDATES