Warning added for missing metadata file

Author: abzer005

pages/1_Data_Preparation.py

@@ -53,7 +53,7 @@
             st.session_state["ft_gnps"], st.session_state["md_gnps"] = load_from_gnps(task_id, cmn= cmn_flag)   
 
         if not st.session_state["ft_gnps"].empty and st.session_state["md_gnps"].empty:
-            st.warning("Meta data is empty. Please upload one.")
+            st.warning("⚠️ **Metadata file is missing.** The metadata is essential for performing statistical analysis and understanding the context of your data. Please upload one.")
 
             md_file = st.file_uploader("Meta Data Table")
             if md_file:

src/fileselection.py

@@ -78,10 +78,17 @@ def load_from_gnps(task_id, cmn=False):
             an_url = f"https://proteomics2.ucsd.edu/ProteoSAFe/DownloadResultFile?task={task_id}&file=DB_result/&block=main"
 
             ft = pd.read_csv(ft_url)
-            md = pd.read_csv(md_url, sep="\t", index_col="filename")
-            an = pd.read_csv(an_url, sep = "\t")[["#Scan#", "Compound_Name"]].set_index("#Scan#")
+            try:
+                md = pd.read_csv(md_url, sep="\t", index_col="filename")
+            except (urllib.error.HTTPError, FileNotFoundError, KeyError, pd.errors.EmptyDataError):
+                md = pd.DataFrame()
+                
+            try:
+                an = pd.read_csv(an_url, sep="\t")[["#Scan#", "Compound_Name"]].set_index("#Scan#")
+            except (pd.errors.EmptyDataError, FileNotFoundError, KeyError):
+                an = pd.DataFrame()
 
-    if md.empty: # Handle empty metadata
+    if not isinstance(md, pd.DataFrame): # Handle empty metadata
         md = pd.DataFrame()
 
     if cmn: