Revert "Don't need two try/catch statments if nothing happens when exception is caught"

This reverts commit 6b86942ccb.

lib/wallet.py

@@ -694,7 +694,9 @@ class Wallet:
             f = open(self.path,"r")
             data = f.read()
             f.close()
-            
+        except:
+            return
+        try:
             d = ast.literal_eval( data )  #parse raw data from reading wallet file
             interface.old_to_new(d)