fix: return 400 when text param is missing in text_search

Closes #862

request.args.get('text') returns None if the query param is absent.
Passing None into db.text_search() causes re.search() to raise
TypeError: expected string or bytes-like object.
Return a 400 before reaching the database call.

Author: shiwani42

application/tests/web_main_test.py

@@ -452,6 +452,12 @@ def test_test_search(self) -> None:
         collection.add_node(docs["sa"])
 
         with self.app.test_client() as client:
+            response = client.get("/rest/v1/text_search")
+            self.assertEqual(400, response.status_code)
+
+            response = client.get("/rest/v1/text_search?text=")
+            self.assertEqual(400, response.status_code)
+
             response = client.get(f"/rest/v1/text_search?text='CRE:2'")
             self.assertEqual(404, response.status_code)
 

application/web/web_main.py

@@ -559,6 +559,8 @@ def text_search() -> Any:
     """
     database = db.Node_collection()
     text = request.args.get("text")
+    if not text:
+        return jsonify({"error": "text parameter is required"}), 400
     if posthog:
         posthog.capture(f"text_search", f"text:{text}")