Add check for API keys

app.py

@@ -335,12 +335,12 @@ def run_evaluation(chain, retriever, eval_set, grade_prompt, retriever_type, num
 # Auth
 st.sidebar.image("img/diagnostic.jpg")
 
-with st.sidebar.form("user_input"):
+oai_api_key = st.sidebar.text_input("`OpenAI API Key:`", type="password")
+ant_api_key = st.sidebar.text_input("`(Optional) Anthropic API Key:`", type="password")
+os.environ["OPENAI_API_KEY"] = oai_api_key
+os.environ["ANTHROPIC_API_KEY"] = ant_api_key
 
-    oai_api_key = st.sidebar.text_input("`OpenAI API Key:`", type="password")
-    os.environ["OPENAI_API_KEY"] = oai_api_key
-    ant_api_key = st.sidebar.text_input("`(Optional) Anthropic API Key:`", type="password")
-    os.environ["ANTHROPIC_API_KEY"] = ant_api_key
+with st.sidebar.form("user_input"):
 
     num_eval_questions = st.select_slider("`Number of eval questions`",
                                           options=[1, 5, 10, 15, 20], value=5)
@@ -407,7 +407,7 @@ with st.form(key='file_inputs'):
 
     submitted = st.form_submit_button("Submit files")
 
-if uploaded_file:
+if uploaded_file and oai_api_key:
 
     # Load docs
     text = load_docs(uploaded_file)
@@ -481,3 +481,7 @@ if uploaded_file:
                                              color='expt number',
                                              tooltip=['expt number', 'Retrieval score', 'Latency', 'Answer score'])
     st.altair_chart(c, use_container_width=True, theme="streamlit")
+
+else:
+
+    st.warning("Please input file and API key(s)!")