Update app.py

Added None type check to get_web_search_results. Attempt at bug fix for query type.

app.py

@@ -19,7 +19,7 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
     return "What magic will you build ?"
 
 @tool
-def get_web_search_results(query:str)-> str: #it's import to specify the return type
+def get_web_search_results(query: str)-> str: #it's import to specify the return type
     #Keep this format for the description / args / args description but feel free to modify the tool
     """A tool that searchs the web using a query
     Args:
@@ -27,7 +27,10 @@ def get_web_search_results(query:str)-> str: #it's import to specify the return
     """
     try:
         results = DuckDuckGoSearchTool.forward(query)
-        return results
+        if results not None:
+            return results
+        else:
+            return "Your query may be incorrectly formatted. Ensure it is of type str e.g. 'bananas'"
     except Exception as e:
         return f"{query} is an invalid query"