Update app.py

app.py

@@ -34,7 +34,7 @@ def splitIsnad(dataframe):
     
 def network_visualizer(city, year, num_nodes):
     edges = splitIsnad(subsetEdges(city, year))[['Teacher', 'Student', 'Hadiths']].groupby(['Teacher', 'Student']).sum().reset_index()
-    if edges.shape[0] >= num_nodes:
+    if edges.shape[0] > num_nodes:
         edge_15 = edge_15.sample(num_nodes)
     else:
         edge_15 = edge.copy()