update llmchain value

app.py

@@ -701,7 +701,7 @@ agent_ZEROSHOT_REACT_2 = initialize_agent(tools2, GPTfake,
 llm_chain = LLMChain(llm=llm, prompt=prompt)
 llm_chain_2 = LLMChain(llm=GPTfake, prompt=prompt)
 
-print("Test LLM Chain", llm_chain_2({'agent_scratchpad':None, 'input':"what is PDP?"}))
+print("Test LLM Chain", llm_chain_2({'agent_scratchpad':"", 'input':"what is PDP?"}))
 
 # llm_chain_openai = LLMChain(llm=llm, prompt=prompt_openai, verbose=True)