Update app.py

app.py

@@ -1,14 +1,15 @@
 import gradio as gr
 import json,pulp
 def fx(x,y):
-    m=pulp.LpProblem()
-    x=list(map(int,x.split(',')))
-    t=[pulp.LpVariable('t'+str(i),cat=pulp.LpBinary) for i in range(len(x))]
-    m+=pulp.lpDot(x,t)
-    m+=(pulp.lpDot(x,t)==y)
-    m.solve()
-    resu={'data':[x[i] for i in range(len(t)) if pulp.value(t[i])]}
-    return resu
+    if x and y:
+        m=pulp.LpProblem()
+        x=list(map(int,x.split(',')))
+        t=[pulp.LpVariable('t'+str(i),cat=pulp.LpBinary) for i in range(len(x))]
+        m+=pulp.lpDot(x,t)
+        m+=(pulp.lpDot(x,t)==y)
+        m.solve()
+        resu={'data':[x[i] for i in range(len(t)) if pulp.value(t[i])]}
+        return resu
     
 title = "测试WEB APP"
 description = """