Update app.py

app.py

@@ -94,7 +94,8 @@ def Piper(_do,_dont):
         )
         return retu
     except:
-        return ""
+        print("returning None!")
+        return None
 
 def infer(p1,p2):
     name = generate_random_string(12)+".png"
@@ -106,7 +107,7 @@ def infer(p1,p2):
     else:
         _dont = ""
     output = Piper('A '+" ".join(_do),_dont)
-    if output == "":
+    if output == None:
         return output
     else:
         output.images[0].save(name)