Update app.py

app.py

@@ -36,15 +36,17 @@ def show_pdf(file_path):
     st.markdown(pdf_display, unsafe_allow_html=True)
 
 def showdl_counts(file_to_lookat,to_dl_sbs96,to_dl_sbs1536):
-    download_link1 = f'<a href="data:application/octet-stream;base64, \
-            {base64.b64encode(to_dl_sbs96[j]).decode()}" download=" \
-            {file_to_lookat[j].name}96SBS.txt">Download {file_to_lookat[j].name} Single Base Substition (96) table</a>' 
-    
-    download_link2 = f'<a href="data:application/octet-stream;base64, \
-            {base64.b64encode(to_dl_sbs1536[j]).decode()}" download=" \
-            {file_to_lookat[j].name}1536SBS.txt">Download {file_to_lookat[j].name} Single Base Substition (1536) table</a>' 
-    st.markdown(download_link1, unsafe_allow_html=True) 
-    st.markdown(download_link2, unsafe_allow_html=True) 
+    for j in np.arange(0,len(to_dl_sbs)):
+        if to_dl_sbs96[j] != []:
+            download_link1 = f'<a href="data:application/octet-stream;base64, \
+                    {base64.b64encode(to_dl_sbs96[j]).decode()}" download=" \
+                    {file_to_lookat[j].name}96SBS.txt">Download {file_to_lookat[j].name} Single Base Substition (96) table</a>' 
+            
+            download_link2 = f'<a href="data:application/octet-stream;base64, \
+                    {base64.b64encode(to_dl_sbs1536[j]).decode()}" download=" \
+                    {file_to_lookat[j].name}1536SBS.txt">Download {file_to_lookat[j].name} Single Base Substition (1536) table</a>' 
+            st.markdown(download_link1, unsafe_allow_html=True) 
+            st.markdown(download_link2, unsafe_allow_html=True) 
 #@st.cache_data(experimental_allow_widgets=True)
 def showdl(file_to_lookat,to_dl_sbs,to_dl_indel,to_dl_dbs,to_dl_sbs_text,to_dl_indel_text,to_dl_dbs_text,to_dl_sbs_summary_text,to_dl_id_summary_text,to_dl_dbs_summary_text):
     for j in np.arange(0,len(to_dl_sbs)):