Update app.py

app.py

@@ -29,9 +29,11 @@ max_year = int(taraf_s['Year'].max())
 
 
 def plot_timeline(citi = ['المدينه', 'بغداد', 'كوفة', 'بصرة'], min_year = 0, max_year = 400):
-  filtered = taraf_s[taraf_s['City'].isin(citi) & (taraf_s['Year'] >= min_year) & (taraf_s['Year'] <= max_year)]
-  fig = px.line(data_frame = filtered, x = 'Year', y = 'Taraf', title = "Tarafs per Year", color = 'City' )
-  fig.update_layout(title_font_color = 'red', title_x = .5)
+    if min_year >= max_year:
+        raise gr.error('Min Year Cannot be Bigger than Max Year!')
+    filtered = taraf_s[taraf_s['City'].isin(citi) & (taraf_s['Year'] >= min_year) & (taraf_s['Year'] <= max_year)]
+    fig = px.line(data_frame = filtered, x = 'Year', y = 'Taraf', title = "Tarafs per Year", color = 'City' )
+    fig.update_layout(title_font_color = 'red', title_x = .5)