small fixes

app.py

@@ -259,7 +259,8 @@ def process_summary_with_openai(summary):
 
 def process_and_query(input_language=None,audio_input=None,image_input=None,text_input=None):
     try:
-        if text is not None :
+        text = ""
+        if text_input is not None :
             # augment the prompt before feeding it to vectara
             text = "the user asks the following to his health adviser " + text
         # process audio