Add error checking for fasta file loading

app.py

@@ -22,7 +22,11 @@ def predict(model, sequence_file, pairs_file):
     model = get_pretrained(model_map[model])
 
     gr.Info("Loading files...")
-    seqs = SeqIO.to_dict(SeqIO.parse(sequence_file.name, "fasta"))
+    try:
+        seqs = SeqIO.to_dict(SeqIO.parse(sequence_file.name, "fasta"))
+    except ValueError as e:
+        gr.Error("Invalid FASTA file - duplicate entry")
+
     if Path(pairs_file.name).suffix == ".csv":
         pairs = pd.read_csv(pairs_file.name)
     elif Path(pairs_file.name).suffix == ".tsv":