WatlowF4T.prgm_delete now fails when appropriate

Author: Myles Metzler

chamberconnectlibrary/watlowf4t.py

@@ -852,10 +852,8 @@ def prgm_delete(self, N):
             self.client.write_holding(18888, N) #set active profile
             self.client.write_holding(18890, self.inv_watlow_val_dict('delete')) #delete profile
         except ModbusError, exp:
-            if 'Exception code = 4' in exp.message:
-                pass # the program does not exist consume the exception
-            else:
-                raise # something else went wrong pass the exception on up.
+            exp.message = 'Cannot delete program. (original message: %s)' % exp.message
+            raise # something else went wrong pass the exception on up.
 
     @exclusive
     def sample(self, lookup=None):