fix form submit deletion error

pages/upload.py

@@ -6,8 +6,10 @@ from pages.utils import *
 
 # @st.cache
 def app():
+
     '''delete form_submit to run quiz maker on return to page'''
-    del st.session_state.form_submit
+    if st.session_state.form_submit:
+        del st.session_state.form_submit
 
     st.markdown("## Upload Data")
 

pages/view.py

@@ -8,7 +8,8 @@ from pages.utils import db_connect
 def app():
     
     '''delete form_submit to run quiz maker on return to page'''
-    del st.session_state.form_submit
+    if st.session_state.form_submit:
+        del st.session_state.form_submit
     
     st.markdown("## View Data")