Adjust initialization sequence

app.py

@@ -87,7 +87,8 @@ def clip_search(search_query):
 
 
 def string_search():
-    clip_search(st.session_state.search_field_value)
+    if "search_field_value" in st.session_state:
+        clip_search(st.session_state.search_field_value)
 
 
 def load_image_features():
@@ -179,7 +180,7 @@ if "images_info" not in st.session_state:
 
 
 def visualize_gradcam(viz_image_id):
-    if not st.session_state.search_field_value:
+    if "search_field_value" not in st.session_state:
         return
 
     header_cols = st.columns([80, 20], vertical_alignment="bottom")